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Latest Female Stories

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...

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2010-01-25 10:55:43

Shark pups born to virgin mothers can survive over the long-term, according to new research published Jan. 25, 2010 in the Journal of Heredity. The study shows for the first time that some virgin births can result in viable offspring. Genetic analysis led by a Field Museum scientist working with numerous colleagues has confirmed the first known case of a virgin female shark producing multiple offspring that survived. Two daughters of the white-spotted bamboo shark are now more than five years...

2009-09-16 14:04:24

Live birth -- key to much marine life -- depends upon evolution of chromosomal sex determination A new analysis of extinct sea creatures suggests that the transition from egg-laying to live-born young opened up evolutionary pathways that allowed these ancient species to adapt to and thrive in open oceans. The evolutionary sleuthing is described this week in the journal Nature by scientists at Harvard University and the University of Reading who also report that the evolution of live-born...

2009-06-15 10:55:00

New research could help scientists tackle infestation of Great LakesScientists have found the existence of two types of males of a fiercely invasive fish spreading through the Great Lakes, which may provide answers as to how they rapidly reproduce.The research, published in the Journal of Great Lakes Research, looks at the aggressive round goby, a bottom-dwelling fish which infested the Great Lakes watersheds around 1990. Presently, they are working their way inland through rivers and canal...

2009-06-08 14:11:10

U.S. scientists looking at adaptation and survival in a wild population found guppies can adapt to new surroundings in just a few years. A research team led by Swanne Gordon from the University of California-Riverside found guppy populations introduced into new habitats developed new and advantageous traits in just a few years. Gordon and colleagues studied 200 guppies that had been taken from the Yarra River in Trinidad and introduced into two different environments in the nearby Damier...

2009-06-04 12:46:43

Whether baby lizards will turn out to be male or female is a more complicated question than scientists would have ever guessed, according to a new report published online on June 4th in Current Biology, a Cell Press publication. The study shows that for at least one lizard species, egg size matters."We were astonished," said Richard Shine of the University of Sydney. "Our studies on small alpine lizards have revealed another influence on lizard sex: the size of the egg. Big eggs tend to give...

2009-06-02 14:30:00

Study finds guppies adapt to new surroundings in just a few yearsWhat's the secret to surviving during times of environmental change? Evolve"¦quickly.A new article in The American Naturalist finds that guppy populations introduced into new habitats developed new and advantageous traits in just a few years. This is one of only a few studies to look at adaptation and survival in a wild population.A research team led by Swanne Pamela Gordon from the University of California, Riverside...

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...

2009-02-03 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...

2008-06-08 16:34:05

"Every sperm is sacred. Every sperm is great. If a sperm is wasted, God gets quite irate," goes the song from Monty Python's movie The Meaning of Life. If the lyrics strike you as funny, it's most likely because calling a sperm cell "sacred" sounds ridiculous when men can produce so many of them. In fact, the average male will produce roughly 525 billion sperm cells over a lifetime and shed at least one billion of them per month. A healthy adult male can release between 40...


Word of the Day
cacodemon
  • An evil spirit; a devil.
  • A nightmare.
  • In astrology, the twelfth house of a scheme or figure of the heavens: so called from its signifying dreadful things, such as secret enemies, great losses, imprisonment, etc.
'Cacodemon' comes from a Greek term meaning 'evil genius.'
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