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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.



Bay is brown with black.

The Cream Dilution Gene

Is white when homozygous.

What will it do to horses?


brown with black.

CREAM and BROWN

produce

New color: BUCKSKIN


What Pattern of Color Inheritance

Does this show?

Cream dilutes red-brown

To make….



Incomplete

Dominance


Codominance
Codominance

  • A cross where both alleles are equally expressed.


  • 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


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?


X

What will the offspring look like?


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?


X has a roan coat (brown and white hairs) and the female has a white coat (white hairs). What might their calves look like?

What will the offspring look like?


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?


You and your partner carry sickle cell trait. want to know why there are three colors – red, pink and white.

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.


Sickle Cell Anemia want to know why there are three colors – red, pink and white.

Normal

Carrier



X predict the genotypes and phenotypes for the children’s ears.

Hybrid

Hybrid


X predict the genotypes and phenotypes for the children’s ears.

Hybrid

Hybrid


Warm up
Warm-Up predict the genotypes and phenotypes for the children’s ears.

  • No blurting – give everyone a chance

  • Decide if the pictures are examples of:

    • Simple dominance

    • Incomplete dominance

    • Codominance


Andalusian chickens2
Andalusian Chickens predict the genotypes and phenotypes for the children’s ears.


Warm up1
Warm-Up predict the genotypes and phenotypes for the children’s ears.

  • 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 types are an example of co dominance
Blood Types predict the genotypes and phenotypes for the children’s ears.are an example of co-dominance


Human blood types
Human Blood Types predict the genotypes and phenotypes for the children’s ears.


Blood type rules
Blood type rules predict the genotypes and phenotypes for the children’s ears.

  • 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 predict the genotypes and phenotypes for the children’s ears.

  • 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 predict the genotypes and phenotypes for the children’s ears.

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 predict the genotypes and phenotypes for the children’s ears.

  • 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 predict the genotypes and phenotypes for the children’s ears.

  • A trait that is produced (controlled) by two or more genes


Eye color example
Eye Color Example predict the genotypes and phenotypes for the children’s ears.

  • Controlled by at least three genes.

  • Act together to produce your eye color


Lethal genes
Lethal Genes predict the genotypes and phenotypes for the children’s ears.

  • Any genetic trait that causes death.

    Examples:

  • Hemophilia- bleed to death

  • Huntington’s disease- brain shrinks


Lethal genes1
Lethal Genes predict the genotypes and phenotypes for the children’s ears.

Hemophilia (lethal and sex-linked)

bleed to death

XhY


Lethal genes2
Lethal Genes predict the genotypes and phenotypes for the children’s ears.

Huntington’s disease- brain shrinks


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