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2010-04-05 07:49:32

Mothers win the genetic tug of war by producing more sons with larger fathers and more daughters with smaller fathers "Be faithful in small things because it is in them that your strength lies." Mother Teresa's words echo throughout the world. They ring particularly true in the biological kingdom among brown anole lizards, as evidenced in research detailed in the April 2 edition of the journal Science. Dartmouth researchers Ryan Calsbeek and Bob Cox study male and female brown anole lizards...

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2010-03-11 14:47:10

In most animal species, males and females show obvious differences in body size. But how can this be, given that both sexes share the same genes governing their growth? University of Arizona entomologists studied this conundrum in moths and found clues that had been overlooked by previous efforts to explain this mystery of nature. Take a look around in the animal world and you will find that, in most organisms, individuals of one sex are larger than the other of the species. Even though...

2010-03-08 09:25:57

Argonaute 9 inhibits asexual reproduction, apparently by silencing transposons One seemingly insurmountable obstacle to the dream of virtually limitless yields of staple crops like corn, wheat and rice is the dependence of those plants on sexual reproduction. When male and female gametes -- sperm and egg -- combine randomly to generate a genetically unique seed, valuable parental traits painstakingly selected by breeders are erased. But what if plants like these could be engineered to...

2009-11-17 14:04:13

Mountain goats are no exception to the general rule among mammals that larger males sire more and healthier offspring. But University of Alberta researcher David Coltman has found a genetic quirk that might make female mountain goats think twice about their romantic partners. Big, heavy males mountain goats shove lightweight Romeos aside taking the eligible females for themselves. The larger males pass their physical attributes and mating success to their male heirs. But Coltman's data shows...

2009-09-10 14:07:17

In a perfect world, for every boy there would of course be a girl, but a new study shows that actual sex ratios can sometimes sway very far from that ideal. In fact, the male-to-female ratio of one tropical butterfly has shifted rapidly over time and space, driven by a parasite that specifically kills males of the species, reveals a report published online on September 10th in Current Biology, a Cell Press publication. "We were surprised at the speed with which change in sex ratio could...

2009-06-18 15:16:39

In the competition for a partner, males typically have to vie with each other "“ be it with a colorful plumage, a large set of antlers or a seductive courtship dance. The females of some species, however, copulate with several males, so that rivals even after mating are still not defeated. So their sperm become rivals. Because greater size can increase the chance of fertilization, in some species truly giant sperm cells have evolved "“ some grow to be even larger than the male...

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2009-04-30 13:50:23

Researchers have discovered a male spider in the Judean foothills of Israel with an evolutionarily effective yet sadistic sexual perversion. For most spiders, the mating ritual involves the male ejecting sperm into the female's vulva, where it is stored it in a pouch called the spermatheca. These receptacles give the female control of when her eggs will be fertilized, by moving sperm onto them before she lays. The spermatheca is a "last in, first out" structure which means that the last male...

2009-04-26 23:00:00

A researcher at Ohio State University says he is working on producing larger bluegill by breeding super males with two Y chromosomes. The male bluegill are about twice as big as females and thus more profitable for fish farmers, The Columbus Dispatch reported Sunday. Han-Pin Wang, a researcher in the Ohio State aquaculture lab, uses a method based on the genetic difference between males and females. Like humans, male bluegill normally have an XY chromosome pair while females have XX. Wang...

2009-03-26 10:03:32

Certain bacteria have learned to manipulate the proportion of females and males in insect populations. Now Uppsala University researchers have mapped the entire genome of a bacterium that infects a close relative of the fruit fly. The findings, published in PNAS, reveal extremely high frequencies of gene exchange within this group of bacteria. In the future it is hoped that it will be possible to use sex-manipulating bacteria as environmentally friendly pesticides against harmful...

2009-02-03 10:57:25

Most animals, like humans, have separate sexes "” they are born, live out their lives and reproduce as one sex or the other. However, some animals live as one sex in part of their lifetime and then switch to the other sex, a phenomenon called sequential hermaphroditism. What remains a puzzle, according to Yale scientists, is why the phenomenon is so rare, since their analysis shows the biological "costs" of changing sexes rarely outweigh the advantages.A report by Yale scientists in the...


Latest Male Reference Libraries

0_68051ac6f600313805ed284dd29cba8a
2011-04-28 17:50:48

Wolbachia is a genus of bacteria which infects arthropod species, including a high proportion of insects (~60% of species). It is one of the world's most common parasitic microbes and possibly the most common reproductive parasite in biosphere. Studies have suggested that 25-70% of all insect species are estimated to be potential hosts. Marshall Hertig and Burt Wolbach first identified the bacterium in 1924 in a species of mosquito. Hertig described the genus as Wolbachia pipientis. Not...

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Word of the Day
omadhaun
  • A fool; a simpleton: a term of abuse common in Ireland and to a less extent in the Gaelic-speaking parts of Scotland.
This word is partly Irish in origin.