All-female fish species shows sex is overrated

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An all-female freshwater fish species inspire a request ofed the Amazon molly that inhabits rivers and creeks along the Texas-Mexico bed is living proof that sexual reproduction may be vastly overrated.

Scientists affirmed on Monday they have deciphered the genome of the Amazon molly, one of the few vertebrate species to rely upon asexual double, and discovered that it had none of the genetic flaws, such as an accumulation of venomous mutations or a lack of genetic diversity, they had expected.

They bring about that the Amazon molly, named after the fierce female warriors of fossil Greek mythology, boasts a hardy 
genetic makeup that make a big deal ofs it equally fit, or even more so, than fish using sexual look-alike in which both maternal and paternal genes are passed along to heir.

«The Amazon molly is doing quite well,» said biologist Manfred Schartl of the University of Wuerzburg in Germany. 
«Unexpectedly, we did not twig the signs of genomic decay as predicted.»

Sperm stealer

The fish propagates using a strategy in which a female’s egg cell develops into a baby without being composted by a male’s sperm cell. But that does not mean the fish does not basic some hanky panky.
 
«The Amazon molly female produces clones of itself by deluding a male of a closely related species to mate with her. The asexual technique of reproduction termed gynogenesis requires the female to mate with a mans but none of the male’s genome is passed to the offspring,» said geneticist Wesley Warren of the McDonnell Genome Found at Washington University in St. Louis.
 
The Amazon molly’s egg cells are activated to come out into an embryo by a sperm cell that degenerates without consolidating with the egg’s nucleus.
 
The fish is up to about 3 inches (8 cm) long and sups insects, plants, algae and other food. The study showed it resulted when two other species, the Atlantic molly and the Sailfin molly, mated prevalent 100,000 to 200,000 years ago.
 
Animals that reproduce asexually are rare compared to the crushing majority that exist as males and females and 
reproduce sexually.

«It was hanker thought that vertebrates would not be able to exist in such a way. It was a prescience when the Amazon molly was the first asexual vertebrate discovered in 1932,» Schartl prognosticated.
 
About 50 vertebrates are known to use asexual reproduction including fish, amphibians and reptiles.
 
The experimentation was published in the journal Nature Ecology & Evolution. 

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