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More Patterns of Inheritance. Incomplete Dominance. A cross where neither allele is dominant over the other. The traits appear to be blended together. Ex. Snapdragon flowers RR=Red WW=white RW=pink. Bay is brown with black . . The Cream Dilution Gene Is white when homozygous.

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incomplete dominance
Incomplete Dominance
  • A cross where neither allele is dominant over the other.
  • The traits appear to be blended together.
slide3

Ex. Snapdragon flowers

      • RR=Red
      • WW=white
      • RW=pink
slide5

Bay is brown with black.

The Cream Dilution Gene

Is white when homozygous.

What will it do to horses?

slide6

brown with black.

CREAM and BROWN

produce

New color: BUCKSKIN

slide7

What Pattern of Color Inheritance

Does this show?

Cream dilutes red-brown

To make….

slide9

Incomplete

Dominance

codominance
Codominance
  • A cross where both alleles are equally expressed.
slide11

Ex. Horse Coats

    • CBCB=Brown coat
    • CWCW=White coat
    • CBCW=Roan coat: has both brown and white hairs.
andalusian chickens
Andalusian Chickens
  • Black feathers and white feathers are co-dominant.
  • Cross FB FB and FW FW and what will be produced?
andalusian chickens1
Andalusian Chickens

Q: Cross FB FB and FW FW and what will be produced?

A: A Steel Blue

Chicken FB FW

slide16

Do this:

  • Cross a heterozygous red rose with a homozygous recessive yellow rose. Red is the dominant allele. What are the possible colors of offspring?
slide17

X

What will the offspring look like?

slide18

2. A farmer is planning to mate a bull and cow. The male has a roan coat (brown and white hairs) and the female has a white coat (white hairs). What might their calves look like?

slide19

X

What will the offspring look like?

slide20

3. Your parents have decided to plant some snapdragons and want to know why there are three colors – red, pink and white.

You volunteer to explain it to them by showing them the cross of 2 hybrid pink snap dragons – what are the possible offspring?

slide22
You and your partner carry sickle cell trait.

What are your chances of having a baby with sickle cell anemia?

Use RR for normal blood. RS for carriers and SS for sickle cell anemia.

slide23

Sickle Cell Anemia

Normal

Carrier

slide24
Two heterozygous parents with free earlobes have 4 children predict the genotypes and phenotypes for the children’s ears.

F = free ear lobes

ff = attached ear lobes

slide25

X

Hybrid

Hybrid

slide26

X

Hybrid

Hybrid

warm up
Warm-Up
  • No blurting – give everyone a chance
  • Decide if the pictures are examples of:
    • Simple dominance
    • Incomplete dominance
    • Codominance
warm up1
Warm-Up
  • Complete this problem in your journal:
    • If a man an a woman are having a baby, what are the chances the baby will be a boy? Use a Punnett Square to justify your answer. Hint: Think about which chromosomes a male has and which ones a female has
blood type rules
Blood type rules
  • A is dominant over O
  • B is dominat over O
  • O is recessive to A and B
  • A and B are co-dominant to each other.
x linked genes
X-Linked Genes
  • Genes that are located on the X sex chromosomes.
  • Males will have one copy of the gene.

Normal male- XB Y

Affected Male- Xb Y

  • Females Will have 2 copies of the gene:

Normal Female – XB XB

“Carrier” Female – XB Xb

Affected Female – Xb Xb

gender determination

Y

X

Gender Determination
  • (Very few genes are found on the Y Chromosome)
  • Only females can be carriers for sex-linked disorders on the X.

Carrier – a person who transports the recessive allele but does not show the recessive trait.

*Are they heterozygous or homozygous?*

x chromosome
X Chromosome
  • Recessive genes found there:
    • Colorblindness Xc
    • Baldness Xb
    • Hemophilia - bleeding disorder where blood won’t clot. Xh

A male with the XbY will have the recessive trait for baldness.

polygenic
Polygenic
  • A trait that is produced (controlled) by two or more genes
eye color example
Eye Color Example
  • Controlled by at least three genes.
  • Act together to produce your eye color
lethal genes
Lethal Genes
  • Any genetic trait that causes death.

Examples:

  • Hemophilia- bleed to death
  • Huntington’s disease- brain shrinks
lethal genes1
Lethal Genes

Hemophilia (lethal and sex-linked)

bleed to death

XhY

lethal genes2
Lethal Genes

Huntington’s disease- brain shrinks

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