|minute round particle composed of RNA and protein that is found in the cytoplasm of living cells|
|the first stage of mitosis or meiosis in eukaryotic cell division, during which the nuclear envelope breaks down and strands of chromatin form into chromosomes.|
gamete gam·ete (gām'ēt', gə-mēt')
A reproductive cell having the haploid number of chromosomes, especially a sperm or egg capable of fusing with a gamete of the opposite sex to produce a fertilized egg.
|gamete (gām'ēt') Pronunciation Key
A cell whose nucleus unites with that of another cell to form a new organism. A gamete contains only a single (haploid) set of chromosomes. Animal egg and sperm cells, the nuclei carried in grains of pollen, and egg cells in plant ovules are all gametes. Also called germ cell, reproductive cell, sex cell. See Note at mitosis.
sex, or reproductive, cell containing only one set of dissimilar chromosomes, or half of the genetic material necessary to form a complete organism (i.e., haploid). During fertilization, male and female gametes fuse, producing a diploid (i.e., containing paired chromosomes) zygote. Gametes may be identical in form (isogamy), as in the black mold (Rhizopus), or there may be more than one morphological type (heterogamy), as with many green algae of the genus Chlamydomonas. Gametes of animals, some algae and fungi, and all higher plants exhibit an advanced form of heterogamy called oogamy. In oogamy, one of the gametes is small and motile (the sperm), and the other is large and nonmotile (the egg). See also egg; sperm.
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