I believe the correct answer is true. When a sperm cell penetrates an egg and the two cells fuse together, a diploid zygote forms. A diploid zygote is formed from the fusion of two haploid cells. In fertilization for humans, the egg cell which is a haploid fuses or combines with a sperm cell which is also a haploid cell. The combination forms a 2n diploid cell which is called the zygote.