Social Media Means
Social Media Means
Photo: Karolina Grabowska
Despite odds, fish species that bypasses sexual reproduction is thriving. An international team of scientists has sequenced the genome of the Amazon molly, a fish that reproduces asexually. The researchers expected that the asexual organism would be at a genetic disadvantage, but the Amazon molly is thriving.
In fact, in most states in America, a police officer is allowed to read over your texts and peruse other personal information on your phone...
Read More »
The good news is, there's no strict minimum. Three influencers Insider interviewed — all with under 3,000 Instagram followers — said they got paid...
Read More »Visit the News Hub News Release Despite odds, fish species that bypasses sexual reproduction is thriving Success of asexual reproduction in Amazon molly an evolutionary anomaly by Jim Dryden•February 12, 2018 Manfred Schartl An international team of scientists has sequenced the genome of the Amazon molly, a fish that reproduces asexually. The researchers expected that the asexual organism would be at a genetic disadvantage, but the Amazon molly is thriving. https://biomedradio-media.wustl.edu/embargo/Amazon%20molly%20.mp3 The very rare animals that reproduce asexually — only about one in 1,000 of all living vertebrate species — are thought to be at an evolutionary disadvantage compared with their sexually reproduced counterparts. But that theory doesn’t hold true regarding the Amazon molly, an all-female fish species that has thrived for millennia in the fresh waters along the Mexico-Texas border. To better understand how this fish’s reproduction deviates from the norm, an international team of scientists has sequenced the first Amazon molly genome and the genomes of the original parental species that created this unique fish. Their findings suggest that the molly’s thriving existence is not totally unexpected since they found the fish has a hardy genetic makeup that is often rare in nature and gives the animals some predicted survival benefits. “It appears the stars aligned for this species,” said first author Wesley C. Warren, PhD, an assistant director at the McDonnell Genome Institute at Washington University School of Medicine in St. Louis. “The hybridization of two different species’ genomes into one new one would require nearly perfect compatibility between the elements of those parent genomes to bypass the sexual reproduction practiced by most vertebrate species.” The findings are published Feb. 12 in the journal Nature Ecology & Evolution. Ever since scientists, in 1932, determined that the Amazon molly was the first known asexual vertebrate, they have wondered how this came to be. One of the theories that spells out why asexual reproduction should stand in the way of a species’ sustainability is the idea that if no new DNA is introduced during reproduction, then harmful gene mutations can accumulate over successive generations, leading to eventual extinction. Another hypothesis states that because asexual reproduction limits genetic diversity within a species, the animals eventually become unable to adapt to changes in the environment. “The expectation is that these asexual organisms are at a genetic disadvantage,” said Warren, also an assistant professor of genetics. “In nature, the Amazon molly is doing quite well.”
monthly Adsense Account Most vloggers are paid via direct deposit monthly, typically on the 21st of every month. However, be warned that the...
Read More »
Lakhs to Million Conversion As we know, one million is equal to 10 lakhs, then one lakh is equal to 0.1 million.
Read More »The researchers found that the Amazon molly resulted from a sexual reproduction event involving two different species of fish, when an Atlantic molly first mated with a Sailfin molly 100,000 to 200,000 years ago. Since then, the resulting Amazon molly has been a hybrid species that remarkably has remained frozen in evolutionary time — yet still continues to thrive. “That’s about 500,000 generations if you calculate it out to the present day,” said Warren. “The expectation is that many harmful mutations would accumulate in that time, but that’s not what we found.” The Amazon molly reproduces by “mating” with a male fish of a related species. But the male’s DNA is not incorporated into the offspring. Instead, mating with the male fish triggers the replication of the entire maternal genome. In essence, mollies clone themselves. They don’t lay eggs but instead give birth to large broods of live offspring. Scientists have long theorized that clones, by failing to purge harmful mutations, should experience decay in the genome and eventual extinction over generations. “This study caps an intensive, collaborative study, marking the first glimpse of the genomic features of an asexual vertebrate and setting up a platform for future molecular, cellular and developmental work in this interesting species,” said Michael Lynch, PhD, director of the Biodesign Center for Mechanisms of Evolution at Arizona State University. So although the Amazon molly has thrived for thousands of years, it remains resistant to giving away its genomic secrets — for now. “It may be that the Amazon molly has the best of both worlds,” said Manfred Schartl, professor and chair of biochemistry at the University of Wurzburg in Wurzburg, Germany. “It seems to have some advantages that we see in species that reproduce sexually and other advantages normally seen in species that produce offspring nonsexually, such as large population sizes” Whatever the reasons, the researchers said the Amazon molly is an exception to ideas about the evolutionary disadvantages of asexual reproduction.
10 Certifications that Pay Well Phlebotomist Certification Programs. Medical Assistant Certification Programs. Certified Nurse Assistant...
Read More »
More Tax Guides It boils down to this: If you're getting a sizable refund just about every year and you're having federal taxes held out of your...
Read More »
With proper guidance and hard work, you can have many opportunities to kick start your career as a digital marketer and become rich. Nov 20, 2022
Read More »
Following diagram shows the four different categories of Internet Services. Communication Services. There are various Communication Services...
Read More »
Promotion
Promotion
Promotion