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Rabbit Color Genetics. A simple guide to learning the basics. Why Learn Genetics?. Make informed decisions when choosing colors to breed together Know what colors to expect in a litter Know what genes a rabbit carries just by looking at the pedigree Avoid producing unshowable colors

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Rabbit color genetics

Rabbit Color Genetics

A simple guide to learning the basics


Why learn genetics
Why Learn Genetics?

  • Make informed decisions when choosing colors to breed together

  • Know what colors to expect in a litter

  • Know what genes a rabbit carries just by looking at the pedigree

  • Avoid producing unshowable colors

  • Avoid producing rabbits with “messy” genetics

  • Know how to manipulate genetics to produce desired colors

  • To be a more educated breeder


Genetics don t always work
Genetics don’t always work”

  • False. Rule #1: Genetics is science, not magic.

  • There are rules and every rabbit follows them

  • “Surprise” or “mystery” colors can be the result of several factors:

    • Incorrect pedigree

    • Identifying parents as the wrong color

    • Gene modifiers

    • Writing down the wrong sire


The basics
The Basics

  • There are 5 basic gene series, sometimes called “families”

    • A,B,C,D,E

  • Each rabbit has two genes (more appropriately called alleles but commonly referred to as genes) for each series

  • The first gene in each series is the dominant gene (what we see).

  • The second gene is the recessive (what we don’t see)

  • A rabbit receives one gene from each parent for each series.


Genotypes
Genotypes

  • A genotype is the genetic code for a rabbit’s color

  • Genotype is what we don’t see, phenotype is what we do see.

  • How do we write them?

A

B

C

D

E

(_ _) – (_ _) – (_ _) – (_ _) – (_ _)

recessive

dominant


Punnett squares
Punnett Squares

  • A tool for calculating outcomes of crosses

  • Each result represents the possibility for each kit, not the whole litter


The ladder of dominance
The Ladder of Dominance

  • To visualize how dominance works, use the ladder analogy.

  • Put the most dominant gene on the top rung and the most recessive on the bottom rung with any other genes in the middle in their respective position.

  • The rules:

    • A gene cannot carry a gene that is above it on the ladder.

    • It can carry one of the genes below or itself.


The a series
The A Series

  • Responsible for the pattern of the coat

  • There are three genes in the A Series:

    • A: Agouti

    • at: Tan Pattern

    • a: Self

  • Agouti is the most dominant, self is the most recessive, and tan pattern lies in between.

A

at

a


The a series agouti a
The A Series: Agouti (A)

  • Agouti rabbits will have:

    • Ticking: tips on the hair shaft

    • Rings: when blowing into the coat, there will be rings of different colors.

    • Lacing: Cream or white markings on the chin, inside of legs, inside nostrils, around eyes, inside ear, and bottom of tail

    • Cream/white belly

    • Triangle: An orange, cream, or white triangle shape on the back of the neck


The a series agouti a1
The A Series: Agouti (A)

  • Agouti is the most dominant gene in the A series

  • It can carry either itself, Tan Pattern, or Self.

  • The options for an Agouti rabbit:

    • AA

    • Aat

    • Aa


The a series agouti a2
The A Series: Agouti (A)

  • Examples:

    • Chestnut, Opal, Lynx, Chinchilla, Squirrel, Frosted Pearl/Ermine, Orange, Cream, Fawn, Red, Steel, Tri-Color

Chestnut

Chinchilla

Orange


The a series tan pattern a t
The A Series: Tan Pattern (at)

  • Tan Pattern rabbits will have:

    • Self color on top (black, blue, chocolate, lilac, shaded, tort)

    • White, cream, or tan belly, lacing, and triangle.

  • Tan Pattern cannot carry Agouti.

  • It can carry itself or self

  • The options for a Tan Pattern rabbit:

    • at at

    • at a


The a series tan pattern a t1
The A Series: Tan Pattern (at)

  • Examples:

    • Otters, Silver Martens

Black Otter

Sable Marten


The a series self a
The A Series: Self (a)

  • A Self rabbit will:

    • Be a single color

    • May include shading

    • May have a lighter belly color

    • Never have agouti or tan pattern markings

  • Self is the most recessive gene in the A series

  • Self cannot carry any other gene

  • The options for a Self rabbit:

    • aa


The a series self a1
The A Series: Self (a)

  • Examples:

    • Black, Blue, Chocolate, Lilac, Siamese Sable, Smoke Pearl, Sable Point, Blue Point, Seal, Tort, Himalayan, Ruby Eyed White, Blue Eyed White

Black Tort

Himalayan/Pointed White

Smoke Pearl


The a series1
The A Series

  • Every rabbit is one of the following combinations:

    • Agouti: AA, A at, Aa

    • Tan Pattern: at at, at a

    • Self: aa

  • That is a total of 6 options for every rabbit in the world!


The a series calculating outcomes
The A Series: Calculating Outcomes

  • Breed an Agouti carrying Self to a Tan Pattern carrying Self.

    • Use a punnett square. What are the possibilities?

    • Remember, write the dominant gene first then the recessive


The a series calculating outcomes1
The A Series: Calculating Outcomes

  • Looking just at the dominant gene in each option:

    • 50% chance of Agouti

    • 25% chance of Tan Pattern

    • 25% chance of Self


The a series calculating outcomes2
The A Series: Calculating Outcomes

  • Breed a Self to a Self.

  • What do you notice?

    • 100% of the offspring are Self.

  • Rule #2:

    • When you breed two recessives together, you will yield 100% recessives.


Plugging it in
Plugging it In

  • Time to plug in one of the outcomes to a genotype…let’s use Aa

  • Put the dominant gene on the first underscore, and the recessive on the second.

(_ _) – (_ _) – (_ _) – (_ _) – (_ _)

A

B

C

D

E

A

a


The b series
The B Series

  • Responsible for making a rabbit either Black-based or Chocolate-based

  • There are two genes in the B Series:

    • B: Black

    • b: Chocolate

B

b


The b series black b
The B Series: Black (B)

  • Black is the most dominant gene in the B series

  • It can carry either itself or chocolate

  • The options for a Black rabbit:

    • BB

    • Bb

  • Examples:

    • Chestnut, Opal, Chinchilla, Squirrel, Black Otter, Blue Silver Marten, Black, Blue, Black Tort, Siamese Sable, Smoke Pearl, Sable Point

    • Any “blue” rabbit is Black-based


The b series chocolate b
The B Series: Chocolate (b)

  • Chocolate is the most recessive gene in the B series.

  • It cannot carry Black

  • The options for a Chocolate-based rabbit:

    • bb

  • Examples:

    • Lynx, Chocolate, Chocolate Tort, Chocolate Agouti (Amber/Cinnamon), Chocolate Otter

    • Any “lilac” rabbit is chocolate-based


The b series1
The B Series

  • Every rabbit is one of the following combinations:

    • Black-based: BB, Bb

    • Chocolate-based: bb

  • That is a total of 3 options for every rabbit in the world!

  • Every Black-based color has a Chocolate-based counterpart or “version”

    • Ex: The Chocolate version of Opal is Lynx.


The b series calculating outcomes
The B Series: Calculating Outcomes

  • Breed a Black carrying Chocolate to a Chocolate.

  • What do you notice?

    • 100% of the offspring carry Chocolate

  • Rule #3:

    • When you breed to the most recessive in the series, 100% of the offspring will carry that recessive.


Plugging it in1
Plugging it In

  • Time to plug in one of the outcomes to the previous genotype…let’s use Bb

  • Put the dominant gene on the first underscore, and the recessive on the second.

(_ _) – (_ _) – (_ _) – (_ _) – (_ _)

A

B

C

D

E

A

a

B

b

So far we have a rabbit that is a:

Black-based (B) Agouti (A) carrying self (a) and chocolate (b)


Color options so far
Color Options (so far)

  • If we take the options for the A series (6) and multiply them by the options for the B series (3), it equals a total of 18 genotype options for every rabbit in the world.

  • Or 6 color options for every rabbit:

    • A-B: Black-based Agouti,

    • A-bb: Chocolate Based Agouti

    • at-B: Black-based Tan Pattern

    • at-bb: Chocolate-based Tan Pattern

    • aa-B: Black-based Self

    • aa-bb: Chocolate-based Self


The c series
The C Series

C

  • Responsible for the restriction of color pigment on the coat.

  • There are six genes in the C Series:

    • C: Full Color

    • cchd: Chinchilla (Dark)

    • cchm: Chinchilla Medium

    • cchl: Shaded (Chinchilla Light)

    • ch: Himalayan

    • c: Albino (Ruby-Eyed White/REW)

cchd

cchm

cchl

ch

c


The c series full color c
The C Series: Full Color (C)

  • The most dominant gene in the C series.

  • All four dark brown and all three yellow pigment bands are present in the fur.

  • The options for a Full Color rabbit:

    • CC

    • Ccchd

    • Ccchm

    • Ccchl

    • Cch

    • Cc

  • Examples:

    • Chestnut, Tort, Black, Orange, Steel, Harlequin


The c series chinchilla c chd
The C Series: Chinchilla (cchd)

  • All four dark brown pigment bands but only one yellow band.

  • Turns “yellow” pigment to white/silver

  • Also written as cch3 which is more correct

  • Can be written simply as chd.

  • The options for a Chinchilla rabbit:

    • cchdcchd

    • cchdcchm

    • cchdcchl

    • cchdch

    • cchdc

  • Examples:

    • Chinchilla, Squirrel, Ermine, Marten, Magpie


The c series chinchilla medium c chm
The C Series: Chinchilla Medium (cchm)

  • Reduction in brown pigment, no yellow pigment.

  • Also written as cch2 which is more correct

  • Can be written simply as chm.

  • Uncommon/rare, not preferred

  • The options for a Chinchilla Medium rabbit:

    • cchmcchm

    • cchmcchl

    • cchmch

    • cchmc

  • Examples:

    • Some Chinchillas


The c series shaded c chl
The C Series: Shaded (cchl)

  • Two brown pigment bands, no yellow pigment

  • Also written as cch1 which is more correct

  • Can be written simply as chl.

  • Commonly referred to as the Shaded gene but also “Chinchilla Light”

  • The options for a Shaded rabbit:

    • cchlcchl

    • cchlch

    • cchlc

    • Rule #4: All rabbits that are cchlcchl are automatically Seal

    • Rule #5:A true Sable rabbit must carry either Himalayan or REW ( cchlcch or cchlc)

  • Examples:

    • Siamese Sable, Sable Point, Smoke Pearl, Seal, Sable Marten


The c series himalayan c h
The C Series: Himalayan (ch)

  • Restricts color to only the points: ears, nose, feet, tail

  • Rabbits will always have red eyes

  • Can be written simply as ch.

  • The options for a Shaded rabbit:

    • chch

    • chc

  • Examples:

    • All varieties of Himalayan/Pointed White/Californian


The c series albino c
The C Series: Albino (c)

  • Stops all color from being expressed

  • Solid White rabbits with red eyes

  • The options for an Albino rabbit:

    • cc


The c series1
The C Series

  • Every rabbit is one of the following combinations:

    • CC

    • Ccchd

    • Ccchm

    • Ccchl

    • Cch

    • Cc

    • cchdcchd

    • cchdcchm

    • cchdcchl

    • cchdch

    • cchdc

  • cchmcchm

  • cchmcchl

  • cchmch

  • cchmc

  • cchlcchl

  • cchlch

  • cchlc

  • chch

  • chc

  • cc

Chinchilla Medium

Full Color

Shaded

Himi

Chinchilla


The c series calculating outcomes
The C Series: Calculating Outcomes

  • Breed a Full Color carrying Chinchilla to a Chinchilla carrying REW.

  • Looking just at the dominant gene in each option:

    • 50% chance Full Color

    • 50% chance of Chinchilla

  • Looking just at the recessive gene in each option:

    • 50% Chinchilla carriers

    • 50% REW carriers


The c series calculating outcomes1
The C Series: Calculating Outcomes

  • Breed a Shaded carrying Shaded to a Shaded carrying REW.

  • What do you notice?:

    • 50% chance of Seal (rule #4)

  • Looking just at the recessive gene in each option:

    • 50% REW carriers


Plugging it in2
Plugging it In

  • Time to plug in one of the outcomes to the previous genotype…let’s use cchdc

  • Put the dominant gene on the first underscore, and the recessive on the second.

(_ _) – (_ _) – (__ _) – (_ _) – (_ _)

A

B

C

D

E

A

a

B

b

cchd

c

So far we have a rabbit that is a:

Black-based (B) Chinchilla Agouti (cchd, A) carrying self (a),chocolate (b), and REW (c)


Color options so far1
Color Options (so far)

  • If we take the options for the A series (6) and multiply them by the options for the B series (3) and C Series (21), it equals a total of 378 genotype options for every rabbit in the world!

  • Or 36 color options for every rabbit:

  • A-B-C: Black-based Agouti

  • A-bb-C: Chocolate-based Agouti

  • at-B-C: Black-based Otter

  • at-bb-C: Chocolate-based Otter

  • aa-B-C: Black-based Self

  • aa-bb-C: Chocolate-based Self

  • A-B-cchd: Black-based Chinchilla Agouti,

  • A-bb-cchd: Chocolate-based Chinchilla Agouti

  • at-B-cchd: Black-based Marten

  • at-bb-cchd: Chocolate-based Marten

  • aa-B-cchd: Black-based Self Chinchilla

  • aa-bb-cchd: Chocolate-based Self Chinchilla

  • A-B-cchm: Black-based Chinchilla Agouti

  • A-bb-cchm: Chocolate-based Chinchilla Agouti

  • at-B-cchm: Black-based Marten

  • at-bb-cchm: Chocolate-based Marten

  • aa-B-cchm: Black-based Self Chinchilla

  • aa-bb-cchm: Chocolate-based Self Chinchilla

  • A-B-cchl: Black-based Shaded Agouti

  • A-bb-cchl: Chocolate-based Shaded Agouti

  • at-B-cchl: Black-based Shaded Marten

  • at-bb-cchl: Chocolate-based Shaded Marten

  • aa-B-cchl: Black-based Shaded

  • aa-bb-cchl: Chocolate-based Shaded

  • A-B-ch: Black-based Himalayan Agouti

  • A-bb-ch: Chocolate-based Himalayan Agouti

  • at-B-ch: Black-based Martenized Himalayan

  • at-bb-ch: Chocolate-based Martenized Himalayan

  • aa-B-ch: Black-based Himalayan

  • aa-bb-ch: Chocolate-based Himalayan

  • A-B-cc: Black-based Agouti REW

  • A-bb-cc: Chocolate-based Agouti REW

  • at-B-cc: Black-based Otter REW

  • at-bb-cc: Chocolate-based Otter REW

  • aa-B-cc: Black-based Self REW

  • aa-bb-cc: Chocolate-based Self REW


  • The d series
    The D Series

    • Responsible for diluting the color

    • There are two genes in the B Series:

      • D: Dense

      • d: Dilute

    D

    d


    The d series dense d
    The D Series: Dense (D)

    • Dense is the most dominant gene in the D series

    • It can carry either itself or dilute

    • The options for a Dense rabbit:

      • DD

      • Dd

    • Examples:

      • Chestnut, Black, Siamese Sable, Chinchilla, Chocolate Otter

      • Any Black-based or Chocolate-based rabbit is Dense


    The d series dilute d
    The D Series: Dilute (d)

    • Dilute is the most recessive gene in the D series.

    • It cannot carry Dense

    • The options for a dilute rabbit:

      • dd

    • Examples:

      • Opal, Cream/Fawn, Smoke Pearl, Squirrel, Blue, Lynx, Lilac Tort

      • Any blue-based or lilac-based rabbit is dilute


    The d series1
    The D Series

    • Every rabbit is one of the following combinations:

      • Dense: DD, Dd

      • Dilute: dd

    • Black (B) + Dilute (dd) = Blue-based

    • Chocolate (bb) + Dilute (dd) = Lilac-based

    • Every Dense color has a Dilute counterpart or “version

      • Ex: The dilute version of Chestnut is Opal


    The d series calculating outcomes
    The D Series: Calculating Outcomes

    • Breed a Dense carrying Dilute to a Dilute.

    • What do you notice?

      • 100% of the offspring carry dilute

      • Rule #3applies


    Plugging it in3
    Plugging it In

    • Time to plug in one of the outcomes to the previous genotype…let’s use dd

    (_ _) – (_ _) – (__ _) – (_ _) – (_ _)

    A

    a

    B

    b

    cchd

    c

    d

    d

    So far we have a rabbit that is a:

    Blue-based (B, dd) Chinchilla Agouti (cchd, A) carrying self (a),chocolate (b), and REW (c)

    A

    B

    C

    D

    E


    Color options so far2
    Color Options (so far)

    • If we take the options for the A series (6) and multiply them by the options for the B series (3), C Series (21), and D Series (3) it equals a total of 1134 genotype options for every rabbit in the world!

    • Or 72 color options for every rabbit!

    • Dense options: (feel free to skip the next two slides, they’re for fun!)

    • A-B-C-D: Black-based Agouti

    • A-bb-C-D: Chocolate-based Agouti

    • at-B-C-D: Black-based Otter

    • at-bb-C-D: Chocolate-based Otter

    • aa-B-C-D: Black-based Self

    • aa-bb-C-D: Chocolate-based Self

    • A-B-cchd-D: Black-based Chinchilla Agouti,

    • A-bb-cchd-D: Chocolate-based Chinchilla Agouti

    • at-B-cchd-D: Black-based Marten

    • at-bb-cchd-D: Chocolate-based Marten

    • aa-B-cchd-D: Black-based Self Chinchilla

    • aa-bb-cchd-D: Chocolate-based Self Chinchilla

    • A-B-cchm-D: Black-based Chinchilla Agouti

    • A-bb-cchm-D: Chocolate-based Chinchilla Agouti

    • at-B-cchm-D: Black-based Marten

    • at-bb-cchm-D: Chocolate-based Marten

    • aa-B-cchm-D: Black-based Self Chinchilla

    • aa-bb-cchm-D: Chocolate-based Self Chinchilla

    • A-B-cchl-D: Black-based Shaded Agouti

    • A-bb-cchl-D: Chocolate-based Shaded Agouti

    • at-B-cchl-D: Black-based Shaded Marten

    • at-bb-cchl-D: Chocolate-based Shaded Marten

    • aa-B-cchl-D: Black-based Shaded

    • aa-bb-cchl-D: Chocolate-based Shaded

  • A-B-ch-D: Black-based Himalayan Agouti

  • A-bb-ch-D: Chocolate-based Himalayan Agouti

  • at-B-ch-D: Black-based Martenized Himalayan

  • at-bb-ch-D: Chocolate-based Martenized Himalayan

  • aa-B-ch-D: Black-based Himalayan

  • aa-bb-ch-D: Chocolate-based Himalayan

  • A-B-cc-D: Black-based Agouti REW

  • A-bb-cc-D: Chocolate-based Agouti REW

  • at-B-cc-D: Black-based Otter REW

  • at-bb-cc-D: Chocolate-based Otter REW

  • aa-B-cc-D: Black-based Self REW

  • aa-bb-cc-D: Chocolate-based Self REW


  • Color options so far3
    Color Options (so far)

    • Dilute Options:

    • A-B-C-dd: Blue-based Agouti

    • A-bb-C-dd: Lilac-based Agouti

    • at-B-C-dd: Blue-based Otter

    • at-bb-C-dd: Lilac-based Otter

    • aa-B-C-dd: Black-based Self

    • aa-bb-C-dd: Lilac-based Self

    • A-B-cchd-dd: Blue-based Chinchilla Agouti,

    • A-bb-cchd-dd: Lilac-based Chinchilla Agouti

    • at-B-cchd-dd: Black-based Marten

    • at-bb-cchd-dd: Lilac-based Marten

    • aa-B-cchd-dd: Blue-based Self Chinchilla

    • aa-bb-cchd-dd: Lilac-based Self Chinchilla

    • A-B-cchm-dd: Blue-based Chinchilla Agouti

    • A-bb-cchm-dd: Lilac-based Chinchilla Agouti

    • at-B-cchm-dd: Blue-based Marten

    • at-bb-cchm-dd: Lilac-based Marten

    • aa-B-cchm-dd: Blue-based Self Chinchilla

    • aa-bb-cchm-dd: Lilac-based Self Chinchilla

    • A-B-cchl-dd: Blue-based Shaded Agouti

    • A-bb-cchl-dd: Lilac-based Shaded Agouti

    • at-B-cchl-dd: Blue-based Shaded Marten

    • at-bb-cchl-dd: Lilac-based Shaded Marten

    • aa-B-cchl-dd: Blue-based Shaded

    • aa-bb-cchl-dd: Lilac-based Shaded

  • A-B-ch-dd: Blue-based Himalayan Agouti

  • A-bb-ch-dd: Lilac-based Himalayan Agouti

  • at-B-ch-dd: Blue-based Martenized Himalayan

  • at-bb-ch-dd: Lilac-based Martenized Himalayan

  • aa-B-ch-dd: Blue-based Himalayan

  • aa-bb-ch-dd: Lilac-based Himalayan

  • A-B-cc-dd: Blue-based Agouti REW

  • A-bb-cc-dd: Lilac-based Agouti REW

  • at-B-cc-dd: Blue-based Otter REW

  • at-bb-cc-dd: Lilac-based Otter REW

  • aa-B-cc-dd: Blue-based Self REW

  • aa-bb-cc-dd: Lilac-based Self REW


  • The e series
    The E Series

    Ed

    • Responsible for the extension of color pigment on the coat.

    • There are five genes in the C Series:

      • Ed: Dark Extension

      • Es: Steel

      • E: Full Extension

      • ej: Harlequin

      • e: Non-Extension

    Es

    E

    ej

    e


    The e series dark extension e d
    The E Series: Dark Extension (Ed)

    • The most dominant gene in the E Series.

    • Very rare and not much known about this gene, however, there is evidence it does exist.

    • Extends the color so much that it can make a Chestnut look Black.

    • Found in Havanas and English Spots

    • The options for a Dark Extension rabbit:

      • EdEd

      • EdEs

      • EdE

      • Edej

      • Ede


    The e series steel e s
    The E Series: Steel (Es)

    • Covers the middle band of color in Agoutis and leaves ticking

    • The options for a Steel rabbit:

      • EsEs

      • EsE

      • Es ej

      • Ese

    • Examples:

      • Gold Tipped Steel, Sable Steel, Silver Tipped Steel


    The e series full extension e
    The E Series: Full Extension(E)

    • Allows dark brown pigment to be fully expressed

    • The options for a Full Extension rabbit:

      • EE

      • Eej

      • Ee

    • Examples:

      • Chestnut, Siamese Sable, Chinchilla, Himalayan, Chocolate


    The e series harlequin e j
    The E Series: Harlequin (ej)

    • Keeps bands of color in separate areas instead of on one hair shaft

    • The options for a Harlequin rabbit:

      • ej ej

      • ej e

    • Examples:

      • Harlequin, Tri-Color, Magpie


    The e series non extension e
    The E Series: Non-Extension (e)

    • Removes most dark brown pigment

    • The options for a Non-Extension rabbit:

      • ee

    • Examples:

      • Orange, Sable Point, Frosted Pearl/Ermine, Tort


    The e series1
    The E Series

    • Every rabbit is one of the following combinations:

      • EdEd

      • EdEs

      • EdE

      • Edej

      • Ede

      • EsEs

      • EsE

      • Esej

      • Ese

    • EE

    • Eej

    • Ee

    • ejej

    • eje

    • ee

    FullExtension

    Dark Extension

    Harlequin

    Steel


    The e series calculating outcomes
    The E Series: Calculating Outcomes

    • Breed a Full Extension carrying Non Extension to a Steel carrying Full Extension.

    • Looking just at the dominant gene in each option:

      • 50% chance Steels

      • 50% chance of Full Extension


    Plugging it in4
    Plugging it In

    • Time to plug in one of the outcomes to the previous genotype…let’s use Ee

    (_ _) – (_ _) – (__ _) – (_ _) – (_ _)

    A

    a

    B

    b

    cchd

    c

    d

    d

    E

    e

    So far we have a rabbit that is a:

    Blue-based (B, dd), Full Extension (E) Chinchilla Agouti (cchd, A) carrying self (a),chocolate (b), REW (c), and Non-Extension (e)

    Add all that up and we get a…

    Squirrel!

    A

    B

    C

    D

    E


    Color options
    Color Options

    • If we take the options for the A series (6) and multiply them by the options for the B series (3), C Series (21), and D Series (3), and E Series (15), it equals a total of 17,010 genotype options for every rabbit in the world!

    • Or 360 color options for every rabbit!

    • No, we won’t look at the options, you get the idea.


    Practice
    Practice

    • Let’s breed two genotypes together to see our possible outcomes.

    • Breeding:

      • Sire: Chinchilla carrying self, dilute, REW, and non-extension

      • Dam: Black carrying Shaded


    Practice1
    Practice

    • The Sire:

      • Get a piece of paper and pen and try to write the sire’s genotype. Use deductive reasoning to figure out what he isn’t carrying and make assumptions.

      • Chinchilla is… Agouti so we write A. He carries Self so we write a.

      • We didn’t specify that the sire is chocolate or carries it so we can assume he is Black-based so we write BB.

      • Chinchilla has the….chd gene and he carries REW so we write chd c.

      • Chinchilla is a Dense color so we write D. He carries dilute also so we write d.

      • Chinchilla is also a Full-Extension color and he is carrying Non-Extension so we write Ee.

    (_ _) – (_ _) – (__ _) – (_ _) – (_ _)

    A

    B

    C

    D

    E

    B

    B

    chd

    c

    D

    d

    E

    e

    A

    a


    Practice2
    Practice

    • The Dam:

      • Black is… Self so we write a. Self rabbits can’t carry anything else from the A series so we automatically give her a second a.

      • We didn’t specify that the dam carries chocolate so we can assume she is BB.

      • Black has the….Full Color gene and she carries Shaded so we write Cchl.

      • Black is a Dense color so we write D. She does not carry dilute so we write a second D.

      • Black is also a Full-Extension color. We didn’t specify that she carried any other E series gene so we give her a second E.

    (_ _) – (_ _) – (_ __) – (_ _) – (_ _)

    A

    B

    C

    D

    E

    B

    B

    C

    chl

    D

    D

    E

    E

    a

    a


    The a series2
    The A Series

    • Our Chinchilla sire is Agouti and carries Self so we write Aa.

    • Our Black dam is Self so we write aa.

    • Looking just at the dominant gene in each option:

      • 50% chance of Agouti

      • 50% chance of Self.

    • All offspring carry Self.


    The b series2
    The B Series

    • Our Chinchilla sire is Black-based and doesn’t carry Chocolate so we write BB.

    • Our Black dam does not carry chocolate so we write BB.

    • 100% of the offspring are Black-based.

    • 0% will be or carry Chocolate.


    The c series2
    The C Series

    • Our Chinchilla sire carries REW so we write chd c.

    • Our Black dam is Full Color carrying Shaded so we write Cchl.

    • Looking at just the dominant genes:

      • 50% chance of Full Color

      • 25% chance of Chinchilla

      • 25% chance of Shaded


    The d series2
    The D Series

    • Our Chinchilla sire is Dense and carries Dilute so we write Dd.

    • Our Black dam does not carry dilute so we write DD.

    • Looking at just the dominant genes:

      • 100% will be Dense

      • 50% chance each offspring carries dilute


    The e series2
    The E Series

    • Our Chinchilla sire is Full Extension and carries non-extension so we write Ee.

    • Our Black dam does not carry non-extension so we write Ee.

    • Looking at just the dominant genes:

      • 100% will be Full Extension

      • 50% chance each offspring carries Non-Extension


    Practice3
    Practice

    • Match up each option from each series to figure out the possible colors from this cross.

      • Aa

      • aa

      • BB

      • Cchd

      • Cc

      • chdchl

      • chlc

      • DD

      • Dd

      • EE

      • Ee

    • Aa-BB-Cchd-DD-EE

    • Aa-BB-Cc-DD-EE

    • Aa-BB-chdchl-DD-EE

    • Aa-BB-chlc-DD-EE

    • Aa-BB-Cchd-DD-Ee

    • Aa-BB-Cc-DD-Ee

    • Aa-BB-chdchl-DD-Ee

    • Aa-BB-chlc-DD-Ee

    • Aa-BB-Cchd-Dd-EE

    • Aa-BB-Cc-Dd-EE

    • Aa-BB-chdchl-Dd-EE

    • Aa-BB-chlc-Dd-EE

    • Aa-BB-Cchd-Dd-Ee

    • Aa-BB-Cc-Dd-Ee

    • Aa-BB-chdchl-Dd-Ee

    • Aa-BB-chlc-Dd-Ee

    • aa-BB-Cchd-DD-EE

    • aa-BB-Cc-DD-EE

    • aa-BB-chdchl-DD-EE

    • aa-BB-chlc-DD-EE

    • aa-BB-Cchd-DD-Ee

    • aa-BB-Cc-DD-Ee

    • aa-BB-chdchl-DD-Ee

    • aa-BB-chlc-DD-Ee

    • aa-BB-Cchd-Dd-EE

    • aa-BB-Cc-Dd-EE

    • aa-BB-chdchl-Dd-EE

    • aa-BB-chlc-Dd-EE

    • aa-BB-Cchd-Dd-Ee

    • aa-BB-Cc-Dd-Ee

    • aa-BB-chdchl-Dd-Ee

    • aa-BB-chlc-Dd-Ee


    Practice4
    Practice

    • Let’s simplify that! Remove all the recessives and remove any duplicates:

      • A-B-C-D-E: Chestnut

      • A-B-chd-D-E: Chinchilla

      • A-B-chl-D-E: Sable Chinchilla (Sable Agouti)

      • aa-B-C-D-E Black

      • aa-B-chd-D-E: Self Chinchilla

      • aa-B-chl-D-E: Siamese Sable

    • From 32 specific genotypes we can pull out 6 basic genotypes that will appear differently on the actual rabbit. All genotypes will be those 6 colors with varying recessives.


    Your turn
    Your Turn

    • Practice on your own. Write two logical genotypes (remember the rules of dominance) and follow the same process.

      • How many specific genotypes do you end up with?

      • How many basic colors are possible?

    • Practice makes perfect!


    Conclusion
    Conclusion

    • There are more genes that give us more options but most are specific to certain breeds such as the Dutch gene or Wideband gene. For day-to-day use, the five series are more than enough.

    • Mastering genetics takes memorization and practice.

    • Genetics are a science and while sometimes it seems that some rabbits “break the rules,” there is always a genetic reason why something happened. It is rarely a new mutation but rather a “user error.”


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