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.