Cavey, Michael J. Department of Biology, University of Calgary, Alberta, Canada.
Meinke, David Department of Botany and Microbiology, Oklahoma State University, Stillwater, Oklahoma.
Last reviewed:December 2019
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The formation of an embryo from a fertilized ovum, or zygote. Development begins when the zygote, originating from the fusion of male and female gametes, enters a period of cellular proliferation, or cleavage. Cells of the embryo subsequently give rise to the tissues and organs of the body in a temporal and spatial pattern that creates a functional, multicellular organism. See also: Cleavage (developmental biology)
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