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# Biology/Incomplete Dominance and Codominance

Question
In some chickens, the gene for feather color is controlled by co-dominance. The allele for black is B and the allele for white is W. The heterozygous phenotype is black and white checkers.
What is the genotype for black chickens?
What is the genotype for white chickens?
What is the genotype for checkered chickens?

If two checkered chickens were crossed, what is the probability that:
They would have a black chick? __%
They would have a white chick? __%

Thank you so much :) I need help figuring out how to do these, I'm not looking for just an answer.

Hi Emily
First we set up a table as follows:
Let B = Black
b = white
Phenotypes    Genotypes
Black         BB
white         bb
Checkered     Bb

Now set up a punnett square and fill it in
B        b
B  BB        Bb

b  Bb        bb

Now you calculate the % ages and let me know what your answers are

Biology

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#### Walter Hintz

##### Expertise

Science teacher for over 50 years. MSc. in biology. I can answer questions in general biology, zoology, botany, anatomy and physiology and biochemistry.

##### Experience

I have a MSc in biology and have been a science teacher for over 50 years. At present I am a faculty member at a college and a science consultant at seven catholic schools.

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The Ohio journal of Science
Momentum-The Journal of the Catholic Education Association