单性生殖

生殖形式

单性生殖,又称为孤雌生殖(Parthenogenesis),是雌性动物植物卵子,不经过受精过程,而单独发育成后代的生殖方式,屬於無性生殖,但仍與一般无性生殖稍有區別。

中间为单性生殖的只有雌性个体的物种新墨西哥鞭尾蜥Cnemidophorus neomexicanus),两边为有性生殖的物种,左为雄性小斑纹鞭尾蜥(C. inornatus),右为雌性西部鞭尾蜥(C. tigris)。新墨西哥鞭尾蜥为二者自然杂交产生的物种。

单性生殖一般发生在多种植物无脊椎动物中,但也有一些脊椎动物如某些爬行动物[1](如钩盲蛇红尾蚺科摩多巨蜥哀鳞趾虎新墨西哥鞭尾蜥),在一些特殊的鸟类[2]加州神鷲[3][4])和鲨鱼物種(如窄头双髻鲨条纹斑竹鲨黑边鳍真鲨)中也会出现[5]。如水蚤蜜蜂蒲公英和一些禾类中,这些现象为“天然单性生殖”,人为的刺激未受精卵发育,成为“人工单性生殖”,曾经实验过将青蛙番茄等成功地进行单性生殖,可以完整地保留母体性状。雄性小火蟻是唯一不須與雌性基因結合,可以繁殖自身後代的雄性物種。北美甚至變異出可以向其他雄性提取片段基因或單條染色體用來豐富自己後代基因多樣性的孤雌生殖鈍口螈。

产雄孤雌生殖

单性生殖的后代如果全为雄性,称为“产雄单性生殖”或“产雄孤雌生殖”,例如蜜蜂产育雄蜂秋季後的蚜虫繁殖,就是一种产雄单性生殖,科莫多龍亦然;如果后代全为雌性,称为“产雌单性生殖”或「产雌孤雄生殖」,例如夏季蚜虫繁殖,新墨西哥鞭尾蜥的繁殖等。

注释

  1. ^ Halliday, Tim R.; Kraig Adler (eds.). Reptiles & Amphibians. Torstar Books. 1986: p. 101. ISBN 0-920269-81-8. 
  2. ^ Savage, Thomas F. A Guide to the Recognition of Parthenogenesis in Incubated Turkey Eggs. Oregon State University. September 12, 2005 [2006-10-11]. (原始内容存档于2017-12-06). 
  3. ^ 奇客Solidot | 濒临灭绝的鸟类首次被发现单性生殖. www.solidot.org. [2021-12-07]. (原始内容存档于2021-12-07). 
  4. ^ Endangered birds experience 'virgin birth,' a first for the species. Animals. 2021-10-28 [2021-12-07]. (原始内容存档于2022-02-07) (英语). 
  5. ^ "Female Sharks Can Reproduce Alone, Researchers Find"页面存档备份,存于互联网档案馆), Washington Post, Wednesday, May 23, 2007; Page A02

参考文献

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