Question

In a cross between two heterozygous individuals (eg. Rr X Rr), the expected phenotypic ratio of the offspring would be
Responses
A 1:2:2:1.1:2:2:1.
B 1:2:1.1:2:1.
C 1:1.1:1.
D 3:1.

Answer 1

D — 3:1.

Rr × Rr gives genotypes 1 RR : 2 Rr : 1 rr; RR and Rr show the dominant phenotype (3) and rr the recessive (1), so the phenotypic ratio is 3:1.