Month: September 2022

VERTEBRATE PARTHENOGENESIS. "Some vertebrate animals, such as certain reptiles, amphibians, and fish, also reproduce through parthenogenesis. Although more common in plants, parthenogenesis has been observed in animal species that were segregated by sex in terrestrial or marine zoos. Two Komodo dragons, a bonnethead shark, and a blacktip shark have produced parthenogenic young when the females have been isolated from males." https://lnkd.in/d_e3R-w View in LinkedIn

“ASEXUAL PARTHENOGENESIS is used by the Komodo Dragon, which can reproduce without a mate. Bees, wasps and ants which have no sex chromosomes reproduce by this method. Some reptiles and fish also utilize parthenogenesis.” https://lnkd.in/gMaYvUK View in LinkedIn

INTERESTING QUESTION. "Parthenogenesis — the ability to produce offspring from unfertilized eggs — is widespread among invertebrates and now increasingly found in normally sexual vertebrates. Are these cases reproductive errors or could they be a first step in the emergence of new parthenogenetic lineages?" https://lnkd.in/gvZ8CFZ View in LinkedIn

LACK OF MAMMALIAN PARTHENOGENESIS. "Mammals are believed to be completely unable to reproduce via parthenogenesis because of a number of developmental and genetic constraints." http://www.sciencedirect.com/science/article/pii/S0960982215007824 View in LinkedIn

VIRGIN BIRTH. "The phenomenon of virgin birth has long fascinated scientists and laymen alike. The first account of parthenogenesis in the literature is the prophecy of Jesus Christ’s birth in Isaiah 7:14: “Therefore the Lord himself will give you a sign: The virgin will conceive and give birth to a son, and will call him Immanuel”. This reference to parthenogenesis is unusual in two ways: first, it is the only account of ‘natural parthenogenesis’ in a mammal." http://www.sciencedirect.com/science/article/pii/S0960982215007824 View in LinkedIn

VIRGIN BIRTH OF MALES. "In contrast to humans, parthenogenetic production of sons is expected in species with other types of sex determination. For example, in birds, some reptiles and butterflies, females are the heterogametic sex: they carry two differentiated sex chromosomes (Z and W) while males are homogametic (ZZ)." http://www.sciencedirect.com/science/article/pii/S0960982215007824 View in LinkedIn

AUTOMICTIC. "Thus, automictic parthenogenesis is the mechanism underlying the occasional production of sons and daughters well known for many species of bagworm moths and recently described in some reptile species, including Komodo dragons and snakes." http://www.sciencedirect.com/science/article/pii/S0960982215007824 View in LinkedIn

VIRGIN BIRTH OF FEMALES. "While male-producing parthenogenesis is rare, female-producing parthenogenesis is widespread among animals and mostly obligate, with many documented cases in species-rich invertebrate groups such as insects, nematodes and crustaceans, and with only few examples in vertebrates." https://lnkd.in/gvZ8CFZ View in LinkedIn

VIRGIN BIRTH IN FRUIT FLIES. "Of 40 Drosophila species screened to date, a majority have shown some ability to at least initiate parthenogenetic development. In one case, Drosophila mangebeirai, natural populations are entirely female, making it the only obligate parthenogenetic species of Drosophila. Only a few of the species that exhibit the ability to undergo early embryonic development of unfertilized eggs successfully respond to selection for parthenogenetic production of adult flies." https://lnkd.in/gPUGWFf View in LinkedIn

VARIANT DEVELOPMENT. "Parthenogenesis occurs in a wide range of animal taxa and is produced by a variety of different underlying mechanisms. Parthenogenesis was not the ancestral state in the taxa where it occurs; at some point in their evolutionary histories, genetic variants must have arisen that (1) allowed impaternate development of embryos, and (2) were favored by existing ecological or demographic factors." http://www.g3journal.org/content/3/4/757.full View in LinkedIn