Question

Investigators at a crime scene have isolated DNA from a Y chromosome and have analyzed it for STRs. They have a prime suspect, but he is not cooperating. However, several of his relatives are willing to help by donating DNA samples. Which relative will have the most similar Y chromosome?

Answer 1

His father

Step-by-step explanation:

In your genetics, you have two sets of chromosomes. One set comes from your mother, and one set comes from your father.

Your mother is able to pass on an X chromosome, however, your father could pass on either an X or a Y chromosome, and the father's contribution of chromosomes determine the gender of the baby.

Hence, if the investigators need to find the DNA of the Y chromosome, the father would be the best option to test, since the sex chromosomes remain almost identical throughout the family lines.