Humans, and other organisms that reproduce through sexual means, obtain approximately half of their DNA sequence from the father, and half from the mother.

This is a result of...

A.
stronger genes from one diploid gamete beating out weaker ones from the other.

B.
a haploid egg combining with a haploid sperm to form a diploid zygote.

C.
the alleles from a haploid sperm combining with only the healthiest alleles from a diploid egg.

D.
the father contributing the X chromosome and the mother contributing the Y chromosome.