The length of the index finger is sex-influenced. The short allele is dominant i

Question

The length of the index finger is sex-influenced. The short allele is dominant in males, whereas the long allele is dominant in females. If a male with long index fingers and a female with short index fingers have offspring together, what are the possible phenotypes of the offspring?

a) males with long index fingers and females with short index fingers
b) males with long index fingers and females with long index fingers
c) males with short index fingers and females with short index fingers
d) males with short index fingers and females with long index fingers

d) is the answer. Can someone explain why? I cant understand how to set up the question.

Explanation / Answer

Since short alleles are dominant in males and long alleles are dominant in females so if breeding takes place between male with long index fingers with a female with short index fingers then the offspring will have more probability to get the shorter allele which is short index fingers because long index fingers in males is recessive and it would get the longer allele which is long index fingers if it is a female because in females short index fingers is recessive. So the answer will be

(d) Males with short index fingers and females with long index fingers

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