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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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srmtrc srmtrc
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9 years ago
In chickens, the presence of feathers on the legs is due to a dominant allele (F), and the absence of leg feathers is due to a recessive allele (f). The comb on the top of the head can be either pea-shaped, a phenotype that is controlled by a dominant allele (P), or a single comb controlled by a recessive allele (p). The two loci assort independently. Assume that a pure-breeding rooster that has feathered legs and a single comb is crossed with a pure-breeding hen that has no leg feathers and a pea-shaped comb. The F1 are crossed to produce the F2. Among the resulting F2, however, only birds with a single comb and feathered legs are allowed to mate. These chickens mate at random to produce F3 progeny.

What is the expected genotype ratio for the resulting F3 progeny?

So, I know the genotypes for the F3 progeny would be FFpp, Ffpp, and ffpp. I thought the ratio of FFpp:Ffpp:ffpp would be 3:2:1, but that's apparently incorrect. Any help would be appreciated, thank you!
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AlexxAlexx
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9 years ago
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srmtrc Author
wrote...
#2
9 years ago
This makes so much more sense now, thank you for drawing out the whole problem. I see it now.
tinytot
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#3
3 years ago
thanks
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#4
3 years ago
im writing a comment like thank you
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#5
3 years ago
Thank you
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