A crocodile in a Costa Rican zoo began guarding a spot in her enclosure. When employees later examined the area, they found 14 eggs. It was the first known case of facultative parthenogenesis, a form of asexual reproduction, involving a crocodile.
species use parthenogenesis. He figured crocodiles, which have similar genes to other reptiles, could do the same.
Polar bodies usually disintegrate. During facultative parthenogenesis, however, a polar body fuses with the egg to create the necessary number of chromosomes to give birth.Booth wanted to prove that the stillborn crocodile was created through facultative parthenogenesis. Dwyer sent him the stillborn and
Scientists don’t know why animals use parthenogenesis, but it might be caused by a species facing extinction or by its population size shrinking in its environment, Booth said. The A gene allowing female crocodiles to reproduce independently might have been passed down over millions of years — including when dinosaurs and flying reptiles existed, Booth said. He said future research might show other animals with similar genes to crocodiles, such as turtles, also use parthenogenesis.
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