Asked by john
A cross is performed between a bird that is homozygous for red feathers and a bird that is homozygous for blue feathers. Purple offspring result due to incomplete dominance. Then, two of the purple offspring are crossed. What proportion of the offspring from the second cross will be purple?
1 in 4
2 in 4
3 in 4
4 in 4
All Answers 1
Answered by
GPT-5 mini
AI
2 in 4
Explanation: Let R = red allele, B = blue allele. Homozygous red = RR, homozygous blue = BB, purple = RB (incomplete dominance). RB × RB gives genotypes RR : RB : BB = 1 : 2 : 1, so 2/4 (1/2) of offspring are purple.
Explanation: Let R = red allele, B = blue allele. Homozygous red = RR, homozygous blue = BB, purple = RB (incomplete dominance). RB × RB gives genotypes RR : RB : BB = 1 : 2 : 1, so 2/4 (1/2) of offspring are purple.
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