A breeder of cattle has a herd of white cows and a roan bull.Hair color in this breed is controlled by an incompletely dominant gene.The two homozygous forms are either red or white,and the heterozygous is roan.What colors of calves are expected and in what proportions?
A) All white
B) All red
C) 1/2 white, 1/2 roan
D) 1 white, 2 roan, 1 red
E) 1/2 white, 1/2 red

Question

A breeder of cattle has a herd of white cows and a roan bull.Hair color in this breed is controlled by an incompletely dominant gene.The two homozygous forms are either red or white,and the heterozygous is roan.What colors of calves are expected and in what proportions?  
A) All white
B) All red
C) 1/2 white, 1/2 roan
D) 1 white, 2 roan, 1 red
E) 1/2 white, 1/2 red

Quizplus · Accepted Answer

The incompletely dominant gene means that the heterozygous form (roan) is a blend of the two homozygous forms (red and white). Therefore, the expected colors of calves are white and roan, in a 1:2 ratio.

A Breeder of Cattle Has a Herd of White Cows