2. In chickens, rrpp gives birds a single comb, R_P_ gives a walnut comb, rrP_ gives a pea comb, and R_pp gives a rose comb.
a. What comb types will appear in the F1 and F2, and in what proportions, if a single-comb bird (rrpp) is crossed to a true-breeding walnut-comb bird (RRPP)? (2 pt)