In mammals, some genes are expressed differently depending on their parent of origin. This ensures that mammals develop from embryos with one maternal and one paternal genome.
One of the advantages of sexual reproduction is the production of novel arrangements of genes on chromosomes due to recombination during meiosis. This effect is further magnified upon fertilization because offspring:
A)may have allele combinations of genes that are not seen in either parent. B)will have higher fitness than either parent because of the union of gametes. C)will have more alleles than either parent. D)will have more chromosomes than either parent.