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:10/31/2014)... in cities is good for attracting species, but it may ... University of Iowa study has found. , The researchers surveyed ... and recorded the abundance of two insects that interact with ... trees, black cherry and black walnut, they didn,t find a ... that feed on the walnuts and black cherries and a ...
(Date:10/31/2014)... been studying the behavior of approximately 300 wild ... They observed that ravens slowly build alliances through ... they also observed that these affiliative interactions were ... about 50 % of the cases these interventions ... ravens, intervening can be potentially risky when the ...
(Date:10/30/2014)... LANSING, Mich. – When most animals begin life, cells ... or a vital organ. However, mammals, including humans, are ... a different first choice – to become the protective ... It,s during this critical first step that research from ... published in the current issue of PLOS ...
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