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Sexual reproduction is the most common life cycle in multicellular eukaryotes, such as animals, fungi and plants. [6] [7] Sexual reproduction also occurs in some unicellular eukaryotes. [2] [8] Sexual reproduction does not occur in prokaryotes, unicellular organisms without cell nuclei, such as bacteria and archaea.
In biology, mating is the pairing of either opposite-sex or hermaphroditic organisms for the purposes of sexual reproduction. Fertilization is the fusion of two gametes. [1] Copulation is the union of the sex organs of two sexually reproducing animals for insemination and subsequent internal fertilization. [2]
Necrophilia: This describes when an animal engages in a sexual act with a dead animal. It has been observed in mammals, birds, reptiles and frogs. [122] Bisexuality: This describes when an animal shows sexual behaviour towards both males and females. Extended female sexuality: This is when females mate with males outside of their conceptive period.
Sexual reproduction has many drawbacks, since it requires far more energy than asexual reproduction and diverts the organisms from other pursuits, and there is some argument about why so many species use it. George C. Williams used lottery tickets as an analogy in one explanation for the widespread use of sexual reproduction. [36]
In zoology, copulation is animal sexual behavior in which a male introduces sperm into the female's body, especially directly into her reproductive tract. [ 1 ] [ 2 ] This is an aspect of mating . Many aquatic animals use external fertilization , whereas internal fertilization may have developed from a need to maintain gametes in a liquid ...
Sexual reproduction is nearly universal in animals, such as these dragonflies. Nearly all animals make use of some form of sexual reproduction. [29] They produce haploid gametes by meiosis; the smaller, motile gametes are spermatozoa and the larger, non-motile gametes are ova. [30]
Asexual reproduction in animals (1 C, 10 P) B. Bird breeding (3 C, 26 P) Birth (5 C, 4 P) ... Animal sexual behaviour; Apophallation; Arrhenotoky; B. Bimodal ...
The articles in this category are primarily about mating in animals, although a few of them (such as mating in yeast and mating in fungi) are about other types of organisms. Wikimedia Commons has media related to Mating .