Question

which two people would have the most different y chromosome?
a boy and his biological fathers father
two fraternal twin brothers
a boy and his fathers paternal grandfather
a father and his biological son
a father and his daughters biological son

Explanation:

The Y chromosome is passed paternally (from father to son). Fraternal twins develop from separate eggs fertilized by different sperm, so their Y chromosomes (if both are male) come from different sperm cells of the father, leading to more differences than direct paternal line relatives who share nearly identical Y chromosomes. Other options involve direct paternal lineage with minimal Y chromosome variation.

Answer:

two fraternal twin brothers