a regressive evolution scenario in some model species. “Everything indicates that the AR machinery is a genetically robust system. In the case of humans, many of the enzymes that regulate the synthesis and degradation of AR are known. Understanding how this system has evolved and how these enzymes work is relevant to our health ”, concludes the researcher.Rare animals that reproduce asexually – only a thousand of all living vertebrate species – are thought to be at an evolutionary disadvantage compared to other animals that do so sexually. One of the theories that explain this is the idea that if new DNA is not introduced during reproduction, harmful genetic mutations can accumulate in successive generations, leading to

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the extinction of the species in the long Slovenia WhatsApp Number List run. Another hypothesis establishes that because asexual reproduction limits genetic diversity in species, animals end up being unable to adapt to changes in the environment. These theories, however, do not hold in the case of theAmazon molly (Poecilia Formosa), an entirely female species of fish that has thrived for millennia in the fresh waters of the Texas-Mexico border. To better understand how the reproduction of this fish deviates from the norm, an international team of scientists has sequenced the first genome of the Amazon molly and the genomes of the original species that converged on this unique fish. Their findings suggest that the existence of the species is not totally unexpected since they

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saw that it has a low genetic makeup, rare to see in nature, and that it provides animals with some benefits related to survival. The results of this research have been published in the journal Nature Ecology & Evolution , and among its authors are Raquel García Pérez , a researcher at the Institute of Evolutionary Biology (IBE), and Tomás Marqués-Bonet, ICREA research professor at UPF and director of the same institute. The Amazon molly was the first asexual vertebrate, discovered in 1932. It reproduces by “mating” with a male fish of a related species. The male’s DNA, however, is not incorporated into the offspring. Instead, mating with the male fish triggers the replication of the entire maternal genome. In essence, the mollies clone themselves.

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