AP BIOLOGY

HEREDITY

CODOMINANCE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Black (BB) chickens crossed with White (WW) chickens result in spotted chickens due to codominance. If 2 spotted chickens are crossed what is the percentage of black chickens?
A
0%
B
25%
C
50%
D
100%
Explanation: 

Detailed explanation-1: -Gray: 100% Cross a BLACK chicken (BB) with a WHITE chicken (WW). These alleles show INCOMPLETE DOMINANCE.

Detailed explanation-2: -In some varieties of chickens, the allele for black feathers is codominant with the allele for white feathers. A cross between a black chicken and a white chicken will result in a chicken with both black and white feathers. Multiple alleles.

Detailed explanation-3: -In the given case, alleles for black color and white color are expressed independently in the offspring, generating a black and white speckled offspring. So, this serves as an example of codominance.

Detailed explanation-4: -The allele for black feathers is B and white feathers is W. The heterogenous genotype is known as erminette. Erminette chickens will look “spotted”.

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