Question

In cattle, the cam colour red and white are two dominant traits. which express equally in F1 to produce roan (red and white colour in equal proportion). If F1 progeny are self-bred, the resulting progeny in F2 will have phenotypic ratio (red:roan:white) is

• A. 1:1:1
• B. 3:9:3
• C. 1:2:1
• D. 3:9:4

Answer 1

Answer: (C)

1:2:1

When the red coat color of cattle is crossed with white coat color cattle, the roan variety is produced. When the roan variety is self-bred, the progeny is obtained in the 1 red:2 roan:1 white. The genotypic and the phenotypic ratio are 1:2:1.

Thus, the correct answer is option C.