The fertilization of an egg cell by sperm in the uterine tube promotes the development of sexual division and the completion of a cell containing chromosomes of both parents. Human prenatal development is initiated with the fertilization of an ovum (egg) from a female by a sperm cell from the male. The chromosomes within the nucleus of a zygote (fertilized egg) contain all the genetic information necessary for the development and differentiation of body structures. Continue Scrolling To Read More Below...