The fusion of
haploid
gametes is called
fertilization
and creates the single-celled
diploid
zygote
.
The
zygote
contains two versions of each chromosome:
a maternal
homologue
from the
haploid
gamete (egg) of the mother
a paternal
homologue
from the
haploid
gamete (sperm) of the father
The fusion of haploid gametes is called fertilization
and creates the single-celled diploid zygote.