Question

In chickens, the white plumage (P) of the leghorn breed is dominant over colored plumage (p), feathered shanks (S) are dominant over clean shanks (s), and pea comb (C) is dominant over single comb (c). Each of these gene pairs segregates independently. If a homozygous white, feathered, pea combed chicken is crossed with a homozygous colored, clean, single combed chicken and the F1s are mated with colored, clean, single-combed birds, what proportion of the birds in the F2 will produce only white, clean, pea-combed progeny? Justify your answer by showing intermediate diagrams/calculations (Hint: You may also use either Punnett Square or Forked-Line Method to solve the problem, although the latter approach is preferred.)

          In chickens, the white plumage (P) of the leghorn breed is dominant over colored plumage (p), feathered shanks (S) are dominant over clean shanks (s), and pea comb (C) is dominant over single comb (c). Each of these gene pairs segregates independently. If a homozygous white, feathered, pea combed chicken is crossed with a homozygous colored, clean, single combed chicken and the F1s are mated with colored, clean, single-combed birds, what proportion of the birds in the F2 will produce only white, clean, pea-combed progeny? Justify your answer by showing intermediate diagrams/calculations (Hint: You may also use either Punnett Square or Forked-Line Method to solve the problem, although the latter approach is preferred.)

Added by Francis S.

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