Question Detail
Question
A female fruit fly with short wings mates with a male with long wings, all the offspring are long winged. Two of these offspring mate with each other. What percentage of their offspring will have long wings?
Correct Answer
Option C is the correct answer.
Detailed Explanation
Short-winged female (recessive, ss) crossed with long-winged male (dominant, SS) gives all long-winged offspring (Ss). Two heterozygotes (Ss x Ss) give offspring with genotypic ratio 1 SS : 2 Ss : 1 ss. Phenotypic ratio: 3 long : 1 short. So 75% long wings.
Hint
This is a classic monohybrid cross.