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Planets unisexuals

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Researcher Rob Denton holds a unisexual Ambystoma salamander. In a new study, a team of researchers at The Ohio State University traced the animals' genetic history back 3. The research appears Planets unisexuals the journal Evolution. First, a bit about the unisexual Ambystoma salamander: They're female, and they reproduce mainly through cloning and the occasional theft of another salamander species' sperm, which the males of sexual species deposit on leaves and twigs and the like.

When Planets unisexuals happens, it stimulates egg production and the borrowed species' genetic information is sometimes incorporated into the genome of the unisexual salamanders, a process called kleptogenesis. Scientists who study these amphibians and their relatives, which are also called mole salamanders, have theorized that the theft of sperm is part of what has Planets unisexuals the unisexuals around so long.

Two independent teams of astronomers...

If all they ever did was clone themselves, biologists reason, they'd be vulnerable to all kinds of problems that unfold when you don't mix Planets unisexuals the DNA pool and would disappear from the earth fairly quickly. Going into the study, the Ohio State team figured this sperm-borrowing happened with regularity throughout history, said study co-author H. Lisle Gibbs, a professor of evolution, ecology and organismal biology.

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