Crocodile impregnates herself, ‘virgin birth’ intrigues scientists
1 year, 6 months ago

Crocodile impregnates herself, ‘virgin birth’ intrigues scientists

Hindustan Times  

A crocodile in a Costa Rica zoo got pregnant by herself. “We see it in sharks, birds, snakes and lizards and it is remarkably common and widespread”, Dr Warren Booth who analysed the foetus told the BBC. The phenomenon referred to as "virgin birth” - scientifically as parthenogenesis - is very common in birds too. It is titled “Discovery of facultative parthenogenesis in a new world crocodile”. “Once considered rare, the ability of sexually reproducing species to generate offspring without genetic contributions of males, termed facultative parthenogenesis, has been documented across multiple vertebrate lineages, including both avian and non-avian reptiles,” reads a part of the study.

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History of this topic

First case of 'virgin birth' has been found in crocodile 科学家发现首例孤雌生殖美洲鳄
1 year, 6 months ago

First case of 'virgin birth' has been found in crocodile 科学家发现首例孤雌生殖美洲鳄

China Daily  

媒体英语 First case of 'virgin birth' has been found in crocodile 科学家发现首例孤雌生殖美洲鳄 Play audio file 在哥斯达黎加的一家动物园里，人们发现了首个美洲鳄单性繁殖的案例。这只雌性美洲鳄产下的胎儿与母亲的基因相似度达 99.9% 。 The egg was laid by an 18-year-old female American crocodile in Parque Reptiliana in January 2018. 正因如此，爬行动物公园的科学团队联系了美国弗吉尼亚理工学院的研究人员，该团队专门研究这种单性生殖现象，科学术语为 “孤雌生殖”。他们对幼鳄胚胎进行了分析，发现它与其母亲的基因相似度超过99.9%，证实了胚胎没有父亲。 Research team hypothesises that this ability was inherited from a common evolutionary ancestor, suggesting that dinosaurs may also have been capable of reproducing in …

Virgin Births Facultative Parthenogenesis Pregnant Crocodile Type Of Asexual Reproduction In Sexually Reproducing Species Explained
1 year, 6 months ago

Virgin Births Facultative Parthenogenesis Pregnant Crocodile Type Of Asexual Reproduction In Sexually Reproducing Species Explained

ABP News  

An American crocodile from Costa Rica has left scientists intrigued because she represents the first recorded case of "virgin birth" in crocodiles. The study published in Biology Letters said that common facultative parthenogenesis characteristics observed in vertebrates include the fact that the sex of parthenogens is constrained by the species' sex chromosome system. Another characteristic commonly observed in vertebrates showing …

Scientists find crocodile 'virgin birth' at Costa Rica zoo
1 year, 6 months ago

Scientists find crocodile 'virgin birth' at Costa Rica zoo

The Hindu  

Scientists have documented the first-known instance of a "virgin birth" by a crocodile, which had been living in isolation for 16 years at Costa Rican zoo, according to a study published Wednesday. In making an egg cell, a precursor cell divides into four cells: one becomes the egg cell and retains key cellular structures and the gel-like cytoplasm, while the …

Crocodile impregnates herself in Costa Rican zoo, scientists stunned
1 year, 6 months ago

Crocodile impregnates herself in Costa Rican zoo, scientists stunned

Firstpost  

A surprising event has taken place in a zoo in Costa Rica, where a crocodile has become pregnant without any male involvement. The developing fetus found inside her is said to be 99.9 per cent genetically identical to the mother, leaving both the public and scientists amazed. Dr Warren Booth, who examined the fetus, told BBC that this phenomenon, known …

First ‘virgin birth’ in crocodile found in Costa Rica
1 year, 6 months ago

First ‘virgin birth’ in crocodile found in Costa Rica

Al Jazeera  

Female crocodile lived in isolation for some 16 years at Costa Rica zoo before producing egg with fully-formed fetus. Scientists have documented the first-known instance of a “virgin birth” by a crocodile, which had been living in isolation for about 16 years at a Costa Rican zoo, according to a new study. While producing eggs has been documented among captive …

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