In roosters, two genes determine the shape of their comb. The R_pp produces a rose comb, rrP_ produces a pea comb. When both genes have dominant alleles (R_P_), a walnut comb is produced. When both genes are recessive (rrpp), a single comb is produced.
a. What F1 genotypic and phenotypic ratios are obtained from a cross between a pure breeding rose comb rooster (RRpp) and a hen with alleles for pure-breeding pea comb (rrPP).
b. What genotypic and phenotypic ratios are seen in a cross between two F2 individuals? Show your work for full credit.

Question

16-09-2021
Biology

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In roosters, two genes determine the shape of their comb. The R_pp produces a rose comb, rrP_ produces a pea comb. When both genes have dominant alleles (R_P_), a walnut comb is produced. When both genes are recessive (rrpp), a single comb is produced.
a. What F1 genotypic and phenotypic ratios are obtained from a cross between a pure breeding rose comb rooster (RRpp) and a hen with alleles for pure-breeding pea comb (rrPP).
b. What genotypic and phenotypic ratios are seen in a cross between two F2 individuals? Show your work for full credit.

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luisvaschetto luisvaschetto · Answer 1 · 2021-09-22T16:14:12+02:00

The genotype ratio is the proportion of different genotypes observed in the next generation from a genetic cross. The phenotypic ratio is the proportion of phenotypic traits observed from a genetic cross.

In this case, the genetic cross between a rose comb rooster (RRpp) and a pea comb rooster (rrPP) will produce the F1 generation:

Parental gametes: Rp; rP

Cross: Rp x rP

F1 Generation:

Genotype: 100% RrPp
Phenotype: 100% walnut comb (R_P_)

F1 gametes:

1/4 RP; 1/4 Rp; 1/4 rP; 1/4 rp

Punnett square segregate alleles (F2):

1/4 RP 1/4 Rp 1/4 rP 1/4 rp

1/4 RP 1/16 RRPP 1/16 RRPp 1/16 RrPP 1/16 RrPp

1/4 Rp 1/16 RRPp 1/16 RRpp 1/16 RrPp 1/16 Rrpp

1/4 rP 1/16 RrPP 1/16 RrPp 1/16 rrPP 1/16 rrPp

1/4 rp 1/16 RrPp 1/16 Rrpp 1/16 rrPp 1/16 rrpp

Hence, the genotypic and phenotypic ratios in a cross between two F2 will be:

Genotypic ratio F2:

1/16 RRPP
1/8 RRPp
1/16 RRpp
1/8 RrPP
1/4 RrPp
1/8 Rrpp
1/16 rrPP
1/8 rrPp
1/16 rrpp

Phenotypic ratio F2:

9/16 walnut comb (R_P_)
3/16 rose comb (R_pp)
3/16 pea comb (rrP_)
1/16 single comb (rrpp)

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