Dogs, like all species, carry many different genes on each of their chromosomes. The chromosomes that are inherited by the puppies do not always carry the same set of
alleles for these genes as the original matching chromosomes of their parents. This is
a result of
A
dominant alleles influencing recessive alleles.
B
crossing over during meiosis.
с
the independent assortment of homologous pairs of chromosomes
during meiosis.
O
O
D
the parent's cells are diploid, but their gametes are haploid.