In Netherlands dwarf rabbits, a gene showing incomplete dominance produces three phenotypes.Rabbits that are homozygous for one allele are small; individuals that are homozygous for the other allele are deformed and die; individuals that are heterozygous are dwarf.If two dwarf rabbits are mated, what proportion of their surviving offspring are likely to be dwarf?
A) 1/4
B) 1/3
C) 1/2
D) 2/3
E) 3/4

Question

Quizplus · Accepted Answer

When two heterozygous (dwarf) rabbits are mated, the genotypic ratio of their offspring will be 1:2:1 (one small, two dwarf, one deformed and die). Since the deformed ones die, we only consider the surviving offspring, which are the small and dwarf ones. Out of these, 2 out of 3 will be dwarf, making the correct answer 2/3.

In Netherlands Dwarf Rabbits, a Gene Showing Incomplete Dominance Produces