Examlex
Emission and ejaculation are under parasympathetic nerve control.
Dizygotic (DZ) Twins
Twins that derive from two zygotes; fraternal twins.
Mitosis
The form of cell division in which each chromosome splits lengthwise to double in number. Half of each chromosome combines with chemicals to retake its original form and then moves to the new cell.
Sperm
Male reproductive cells that carry a man's DNA and are necessary for the fertilization of a female's egg.
Ova
The female reproductive cells, or eggs, that when fertilized by male sperm can develop into an embryo.
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