44. The genotype r/;p/p gives fowl a single comb, R/-P/ gives a walnut comb, rir

Question

44. The genotype r/;p/p gives fowl a single comb, R/-P/ gives a walnut comb, rir ; P/- gives a pea comb, and R/-pp gives a rose comb (see the illustrations). Assume independent assortment. Single Walnut Pea Rose a. What comb types will appear in the Fi and in the F and in what proportions if single-combed birds are crossed with birds of a true-breeding walnut strain'? b. What are the genotypes of the parents in a walnut x rose mating from which the progeny are g rose, walnut, š pea, and s single? c. What are the genotypes of the parents in a walnut x rose mating from which all the progeny are walnut? d. How many genotypes produce a walnut phenotype? Write them out.

Explanation / Answer

a) single combed birds - rrpp and walnut combed birds - RrPp

F1 generation RrPp, rrPp, Rrpp, rrpp

1/4 RrPp: 1/4 rrPp:1/4 Rrpp: 1/4 rrpp

1/4 walnut comb :1/4 pea comb:1/4 rose comb : 1/4 single comb

b) walnut comb RrPp and rose comb Rrpp

3/8 walnut comb - RRPp, RrPp, RrPp

3/8 rose comb - RRpp, Rrpp,Rrpp

1/4 single comb - rrpp

1/4 pea comb - rrPp

c) walnut strain - RrPP and rose comb - RRpp

RP rP Rp rp rp RrPp rrPp Rrpp rrpp

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