male sperm cell
61fertilization — fertilizational, adj. /ferr tl euh zay sheuhn/, n. 1. an act, process, or instance of fertilizing. 2. the state of being fertilized. 3. Biol. a. the union of male and female gametic nuclei. b. fecundation or impregnation of animals or plants. 4.… …
62Sexual reproduction — is the creation of a new organism by combining the genetic material of two organisms. The two main processes are: meiosis, involving the halving of the number of chromosomes; and fertilization, involving the fusion of two gametes and the… …
63genetics, human — ▪ biology Introduction study of the inheritance of characteristics by children from parents. Inheritance in humans does not differ in any fundamental way from that in other organisms. The study of human heredity occupies a central… …
64Flowering plant — Flowering plants Temporal range: Early Cretaceous Recent …
65Caenorhabditis elegans — Taxobox image width = 300px image caption = An adult hermaphrodite C. elegans worm regnum = Animalia phylum = Nematoda classis = Secernentea ordo = Rhabditida familia = Rhabditidae genus = Caenorhabditis species = C. elegans binomial =… …
66Gamete — A gamete (from Ancient Greek γαμέτης gametes husband / γαμετή gamete wife ) is a cell that fuses with another cell during fertilization (conception) in organisms that reproduce sexually. In species that produce two morphologically distinct types… …
67Man — This article is about adult human males. For humans in general, see Human. For the word, see Man (word). For the island, see Isle of Man. For other uses, see Man (disambiguation). Manhood and Men redirect here. For other uses, see Manhood… …
68pollination — /pol euh nay sheuhn/, n. Bot. the transfer of pollen from the anther to the stigma. [1870 75; POLLINATE + ION] * * * Transfer of pollen grains in seed plants from the stamens, where they form, to the pistil. Pollination is required for… …
69Velvet worm — Taxobox name = Onychophora fossil range = Cambrian – Recent image width = 250px image caption = Velvet worm regnum = Animalia phylum = Onychophora phylum authority = Grube, 1853 subdivision ranks = Extant families subdivision = Peripatidae… …
70spermatogenesis — spermatogenetic /sperr meuh toh jeuh net ik, speuhr mat oh /, adj. /sperr mat euh jen euh sis, sperr meuh teuh /, n. Biol. the origin and development of spermatozoa. [1880 85; < NL; see SPERMATO , GENESIS] * * * ▪ physiology the origin and… …
