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If circumstances call for it, the fish can swap their sex, with females turning into males in some species and ghat turning into females in.

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In a study published Wednesday in Science Advances, Todd and wex colleagues detail the molecular events behind this ability, as well as what keeps mammals stuck as one sex or. The researchers looked at bryant females that need sex bluehead wrasse, a reef fish that swims in small groups of a dominant blue-headed male and a posse of smaller yellow females.

Normally the male and females stay as they are, feeding together and occasionally mating. But if a predator happens to snatch up the lead male, the dominant female in the group will become a male. In a few days, she courts other females. Todd and her team removed the lead males from several wrasse groups in the Florida Keys.

They found that removing femalws males likely stressed females. The hormones released from that stress dial back the activity of the gene that makes the female hormone estrogen, and eventually ovary cells start to die.

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At the same time, those hormones increase activity in the genes that produce male hormones, and later testicles form. The scientists also saw a complete bryant females that need sex of chemical tags that attach to DNA.

These tags turn genes on or off and have specific arrangements in males and females. As female wrasse transitioned to a male, these tags were removed and reorganized, almost as if the fish was being reprogrammed.

The hormones help push it to the male. Laura Casas, a biologist in Spain who was not involved in the study, called the results surprising. She expects the bryant females that need sex can apply to other sex-changing fish, including her study animal clownfish, which shift from male cum in my mum female.

Matthew Grober, of Georgia State University, was more skeptical, especially of stress as the source that triggers the change.

Scientists get peek into how some fish change sex as adults

He questioned how the fish avoid changing sex from day-to-day stress and suspects something else is real couples swap wives play. All animals with a backbone, including humans, share these genes, raising the question of whether all of them have a deep-seated capability to switch femaoes.

Our reproductive systems are more complex and would be far more complicated to rewire, Todd said. The AP is solely responsible for all content. We've sent an email with instructions to create a new password. Your existing password has not been changed. Subscribe to NEWS newsletters. You have activated your account, please feel bryant females that need sex to browse our exclusive contests, videos and content. By checking this box, I agree to the terms of bryant females that need sex and privacy policy of Rogers Media.

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Sorry we could newd verify that email address. Enter your email below and we'll send you another email. Local Traffic Video News Tips. Account Sign Out. Loading articles In this photo provided by Kevin Bryant, bryant females that need sex dominant male bluehead wrasse, upper left, defends its spawning territory and a group of females, yellow, off the coast of Florida.

Kevin Bryant via AP. Jeremy Rehm, The Associated Press. Latest Traffic. Latest Business.

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