oci (R, r, and P comb is produced when at least one dominant allele R is present

Question

oci (R, r, and P comb is produced when at least one dominant allele R is present at one locus and at least one dominant allele P is present at a second locus (genotype R at least one dominant allele is present at the first locus and two recessive alleles locus (genotype R_pp). A pea comb is produced when two recessive alleles are present at the first locus and at least one dominant allele is present at the second (genotype rrP). If two recessive alleles are present at the first and at the second locus (rr pp) a single comb is produced. Progeny with what types of combs and in what proportions will result from the following crosses? P_). A rose comb is produced when at the second

Explanation / Answer

It is given that -

Since the crosses aren't given, a cross between RrPp and RrPp has been shown (as it will show all kinds of genotypes and phenotypes) -

RrPp gives the following choices for the loci: RP, Rp, rP and rp

So, using a Punnett square, we get -

RRPP

(walnut comb)

RRPp

(walnut comb)

RrPP

(walnut comb)

RrPp

(walnut comb)

RRPp

(walnut comb)

RRpp

(rose comb)

RrPp

(walnut comb)

Rrpp

(rose comb)

RrPP

(walnut comb)

RrPp

(walnut comb)

rrPP

(pea comb)

rrPp

(pea comb)

RrPp

(walnut comb)

Rrpp

(rose comb)

rrPp

(pea comb)

rrpp

(single comb)

This gives us the phenotypic proportion = walnut: rose: pea: single = 9: 3: 3: 1

Similarly, other crosses can be worked out.

RP Rp rP rp RP

RRPP

(walnut comb)

RRPp

(walnut comb)

RrPP

(walnut comb)

RrPp

(walnut comb)

Rp

RRPp

(walnut comb)

RRpp

(rose comb)

RrPp

(walnut comb)

Rrpp

(rose comb)

rP

RrPP

(walnut comb)

RrPp

(walnut comb)

rrPP

(pea comb)

rrPp

(pea comb)

rp

RrPp

(walnut comb)

Rrpp

(rose comb)

rrPp

(pea comb)

rrpp

(single comb)

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