After the spermatozoon successfully penetrates the ovum, fertilization occurs when the zygote, which is created when the two sets of genetic material carried by the gametes converge (a single diploid cell). This typically occurs in the ampulla of a fallopian tube. The 23 chromosomes from the ovum's nucleus and the 23 chromosomes from the sperm's nucleus make up the combined genetic material carried by both male and female gametes and are found in the zygote. Before the mitotic division, which results in the development of the embryo's two cells, the 46 chromosomes go through modifications.
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