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Question
In poultry, the genes for rose comb (R) and pea comb (P) produce walnut whenever they occur together (R__ P__); single-combed individuals have the homozygous condition for both genes (rr pp).(a) Give the F1 and F2 phenotypic results of a cross of a pure-breeding rose comb (RR pp) with a pure-breeding pea comb (rr PP).
(b) Give the phenotypic results of a cross of Rr Pp x rr Pp.
(c) Give the phenotypic results of a cross of RR Pp x rr Pp.
(d) Give the phenotypic results of a cross of Rr pp x rr Pp.
(e) Give the phenotypic results of a cross of Rr Pp x rr pp.
Answer
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