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. What will be an ideal response?
Answer: (a) F1: Rr Pp walnut; F2: 9 R__P__ walnut, 3 R__pp
rose, 3 rr P__ pea, 1 rr pp single
(b) 3/8 walnut, 3/8 pea, 1/8 rose, 1/8 single
(c) 3/4 walnut, 1/4 rose
(d) 1/4 walnut, 1/4 rose, 1/4 pea, 1/4 single
(e)1/4 walnut, 1/4 rose, 1/4 pea, 1/4 single
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