Question

niridia is a type of blindness due to a single dominant gene. Migraine headache is the result of a different dominant gene. A man with aniridia, but normal headaches whose mother was not blind, marries a woman who suffers from migraines and has normal vision but whose father did not have migraine headaches. What is the expected proportion of their children that would have both aniridia and migraines together

Answer 1

Answer: 25% of the children will have both anirida and migraine headache

Explanation: The man has a dominant gene for anirida and normal headache with a mom with no blindness. Therefore, the man gene is (Nn) for heterozygous anirida and (mm) for normal headaches and his wife has heterozygous gene for migraine (Mm) 'cause her dad has normal headache and homozygous gene for normal vision(nn) .

Therefore

Nnmm × Mmnn= NnMm Nnmm Nnmm nnmm.

The crossing would give birth to Offspring with nirida and migraine (NnMm) =1/4 ×100= 25%