You are considering the inheritance of some human traits.One trait controls the quality of earwax,and it is controlled by the E gene.Wet earwax is dominant to dry earwax.Another trait is free or attached earlobes,represented by the A gene.Attached earlobes are recessive to free earlobes.Assume that a man who was pure-breeding for dry earwax and free earlobes had children with a woman who was pure-breeding for attached earlobes and wet earwax.What would be the genotype of their offspring?
A) EEAA
B) Eeaa
C) eeAa
D) EeAa

Question

Quizplus · Accepted Answer

The man is homozygous recessive for both traits, so his genotype is ddAA. The woman is also homozygous for both traits, so her genotype is EEww. When we combine their gametes, we get dA and Ew. 
Therefore, the genotype of their offspring would be EeAa, which is heterozygous for both traits.

You Are Considering the Inheritance of Some Human Traits