A zygote is a fertilized ovum. The germ cells undergo meiosis to reach a haploid state (n) as part ofspermatogenesis and oogenesis. The sperm and the unfertilized ovum reinstates a chromosome set in zygote in a diploid state (2n).
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What is a zygote?
Join Britannica’s Publishing Partner Program and our community of experts to gain a global audience for your work! zygote, fertilized egg cell that results from the union of a female gamete (egg, or ovum) with a male gamete ( sperm ).
What chapter in biology is meiosis and sexual reproduction?
Meiosis Sexual Reproduction 鈥?Introduction to Molecular and Cell Biology Chapter 15. Meiosis Sexual Reproduction Figure 15.1 Each of us, like these other large multicellular organisms, begins life as a fertilized egg.
What is the zygote stage of development?
See Article History. Zygote, fertilized egg cell that results from the union of a female gamete (egg, or ovum) with a male gamete (sperm). In the embryonic development of humans and other animals, the zygote stage is brief and is followed by cleavage, when the single cell becomes subdivided into smaller cells.
How is a zygote produced in multicellular organisms?
Multicellular organisms use a similar process, producing gametes that fuse during fertilization to produce a zygote. The zygote then undergoes many round of mitosis to produce an entire organism. Depending on the size of the organism at birth, the development time of the young can vary.