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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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