Question

What is the best evidence to prove that Irene was heterozygous for hemophilia?

-Elizabeth is not a carrier for the trait.
-Tatiana carried the recessive allele.
-Her brother has hemophilia and her sister is a carrier.
-Two of her sons have hemophilia and one does not.

Attachment is here

Answer 1

D

Step-by-step explanation:

Answer 2

D) Two of her sons have hemophilia and one does not.

Step-by-step explanation:

The fact that Waldemar (her son) was hemophilic, is the best evidence to prove that Irene was heterozygous for hemophilia. Walderman received the Y chromosome from his father and an X chromosome from his mother. The X chromosome that he received from his mother carried the recessive allele for the trait, and this is why he had hemophilia. This means that there is no best evidence for Irene´s genotype than her son´s genotype.

I hope it helps you!