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:7/28/2014)... RENO Norwegian explorer Roald Amundsen became the first ... 1911. More than 100 years later, an international team ... Research Institute (DRI) have proven that air pollution from ... 16 ice cores collected from widely spaced locations around ... created the most accurate and precise reconstruction to date ...
(Date:7/27/2014)... nicotine and cotinine, a metabolite of nicotine, can potentially ... smoke. , The carcinogen 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone or NNK is produced ... up in the tobacco smoke. Once inhaled, it is ... activated by a variety of enzymes called Cytochrome P450 ... can partially interfere with the activation of NNK, and ...
(Date:7/27/2014)... wiped them out if it had taken place slightly ... fresh study using up-to-date fossil records and improved analytical ... of the prehistoric creatures, demise, some 66 million years ... years before a 10km-wide asteroid struck what is now ... volcanic activity, changing sea levels and varying temperatures. ...
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