Question

A man with kinky hair has children by a woman with non-kinky hair. They have five children, three of whom have kinky hair. Based on this information alone, what inheritance pattern is seen with the kinky hair trait?

Answer 1

You can determine that kinky hair is a dominant trait. The father must be a heterozygote since not all of his children have kinky hair, giving a 50% chance for kinky hair with each time they reproduce.