Tag: "hermaphroditic" at biology news

The recombination gender gap

...les of sex-biased recombination. For example, some hermaphroditic species of flatworms lack sex chromosomes altogether but still display marked differences in male and female recombination rates. Lenormand and Dutheil realized that selection was not necessarily limited to the adult stage and that differences in sel...

Sperm trading can resolve hermaphrodite mating conflicts

... the bizarre reproductive conflicts encountered by hermaphroditic animals. In some hermaphroditic species, such as C. hirundinina, mating partners may insist on copulating as a "male," "female," or ...

Pesticide combinations imperil frogs, probably contribute to amphibian decline

...hormone estrogen. He was able to produce identical hermaphroditic malformations in frogs by administering estrogen or blocking androgen at the proper time of development. "One week of exposure at the critical time is all that's required to make these males look feminine, which probably interferes with mating," he s...

Worms under stress

...roducing strains are more pollution sensitive than hermaphroditic strains. This in turn has a negative effect on the population growth rate. Alda Alvarez also observed that following the pollution, the toxicity of the nematodes does not increase but is variable. Gene regulation Additionally from a genetic viewp...

New clues to how sex evolves

... they're on. It could be that C. elegans, which is hermaphroditic and grows to maturity in only three days, is under a lot of competitive pressure to reproduce quickly, and that different binding sites on different Pairing Centers makes for faster chromosome pairing and thus faster reproduction -- unlike organisms ...

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(Date:10/14/2014)... millions of years since T. rex took ... University scientists is breathing life back into dinosaurs using ... The research has important implications for how dinosaurs used ... the sense of smell and cool their brains. ... doctoral student Jason Bourke, lead author of the new ...
(Date:10/14/2014)... a new kind of stem cell that can become either ... vessels, according to a study published today in the journal ... cell type contradicts current theory on how organs arise from ... origins of, and future treatment for, liver cancer., Thanks to ... complex being made up of more than 200 cell types. ...
(Date:10/14/2014)... led by researchers at the University of Massachusetts ... Miller School of Medicine (UMMSM) have identified what ... (manic depressive) disorder, a breakthrough that could lead ... as well as depression and other related mood ... week in Nature Molecular Psychiatry , show ...
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