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The egg cell, or ovum (plural ova), is the female reproductive cell in oogamous organisms. The egg cell is typically not capable of active movement, and it is much larger (visible to the naked eye) than the motile sperm cells. When egg and sperm fuse, a diploid cell (the zygote) is formed, which rapidly grows into a new organism.
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Mature mammalian egg cells are relatively large, 0.0039 inches in diameter, and contain many proteins and protein precursors. This is because when a sperm cell introduces its genetic information to that of the egg, the egg must respond quickly so that cell division may begin and a new organism may form.
Egg cell definition is - ovum. Recent Examples on the Web. Respondents were particularly worried that such animals could have enhanced intelligence or carry human sperm and egg cells. — Kelly Servick, Science | AAAS, "Embryo experiments take ‘baby steps’ toward growing human organs in livestock," 26 June 2019 Recent, early research has shown that stem cells can be used to form the ...
The eggs of most animals are giant single cells, containing stockpiles of all the materials needed for initial development of the embryo through to the stage at which the new individual can begin feeding. Before the feeding stage, the giant cell cleaves into many smaller cells, but no net growth occurs. The mammalian embryo is an exception.
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ovum The female gamete or ovum which, when fertilized by a spermatozoon, can give rise to a new individual. The egg is a very large cell, compared with other body cells, and contains only 23 chromosomes, half the normal number (haploid).
The egg is the organic vessel containing the zygote in which an embryo develops until it can survive on its own; at which point the animal hatches. An egg results from fertilization of an egg cell. Most arthropods, vertebrates (excluding mammals), and mollusks lay eggs, although some, such as scorpions do not.
egg cell definition: The definition of an egg cell is the female reproductive ovum that a woman produces monthly. (noun) An example of an egg cell is the female's egg that meets with a man's sperm to create a baby....