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ZygoteIn BIOLOGY, a zygote is the result of fertilization. That is, two haploid cells — usually (but not necessarily in some organisms) a male sperm cell and a female ovum or ovule — merge into a single diploid cell called the zygote. This cell undergoes multiple cell divisions in gametic and sporic meioses (see Biological life cycles) to become an embryo. See also: pregnancy 
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Zygote".