Question

1. in some chickens, the gene for feather color is controlled by codominance. the allele for black is B and the allele for white is W. The hetrozygous phenotpe is known as erminette (BW).

what is the genotype for black chikens?
what is the genotype for white chickens
what is the genotype for erminette chickens?

2. If 2 erminette chickens were crossed, what is the probobility that:
they would have a black chick? ______?
they would have a white chick? ______?

Answer 1

1.
- Black chickens: BB
- White chickens: WW
- Erminette (heterozygous): BW (or WB)

2. Cross BW × BW gives genotypes in ratio 1 BB : 2 BW : 1 WW.
- Probability of a black chick (BB) = 1/4 = 25%
- Probability of a white chick (WW) = 1/4 = 25%