Answer:
100% of the progeny will have a pea comb, rrP-
Step-by-step explanation:
Available data:
- two genes, R and P, control the shape of the comb on the head
- R- P- animals have a 'walnut' comb
- R- pp animals have a 'rose' comb
- rr P- animals have a 'pea' comb
- rr pp animals have a 'single' comb
Cross:
Parentals) rrPP x rrPp
Gametes) rP, rP, rP, rP rP, rP, rp, rp
Punnett square) rP rP rP rP
rP rrPP rrPP rrPP rrPP
rP rrPP rrPP rrPP rrPP
rp rrPp rrPp rrPp rrPp
rp rrPp rrPp rrPp rrPp
F1) Genotype
- 8/16 = 1/2 = 50% of the progeny will be rrPP
- 8/16 = 1/2 = 50% of the progeny will be rrPp
Phenotype
16/16 = 100% of the progeny will have a pea comb