Question

Consider the following family history: Bob has a genetic condition that affects his skin. Bob’s wife, Eleanor, has normal skin. No one in Eleanor’s family has ever had the skin condition. Bob and Eleanor have a large family. Of their eleven children, all six of their sons have normal skin, but all five of their daughters have the same skin condition as Bob.

Answer 1

X chromosome is dominant.

Step-by-step explanation:

Bob has X chromosome ( along with the genes ) and he passes them further to his female children, while the Y chromosomes are passed to his sons. As genes act in pairs, each female child gets each gene from both of their parents. That's why female children get genes from their fathers and sons get their genes from their mothers. In this case, Bob's X chromosome was more dominant and since it's a chromosome for formation of a female child, he passed it on to his female children, not male.