News tagged with sex chromosomes
When someone is raised female and the genes say XY
(AP) -- It's the birth defect people don't talk about. A baby is born not completely male or female. The old term was hermaphrodite, then intersex. Now it's called "disorders of sexual development." Sometimes the person ...
Sep 12, 2009 |
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Male sex chromosome losing genes by rapid evolution, study reveals
Scientists have long suspected that the sex chromosome that only males carry is deteriorating and could disappear entirely within a few million years, but until now, no one has understood the evolutionary ...
Jul 17, 2009 |
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Adam's rib, revisited: Evolutionary divergence of mammalian sex chromosomes
(Phys.org) -- Males and females... Mars and Venus... XY and XX chromosomes -- all are common memes. At the same time, the evolution of therian (placental and marsupial) sex chromosomes is less widely understood. ...
Apr 18, 2012 |
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The story of X -- evolution of a sex chromosome
(PhysOrg.com) -- Move over, Y chromosome - it's time X got some attention. In the first evolutionary study of the chromosome associated with being female, University of California, Berkeley, biologist Doris ...
Apr 16, 2009 |
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Ovaries must suppress their inner male
For an ovary to remain an ovary, the female organ has to continuously suppress its inner capacity to become male. That's the conclusion of a study in the December 11th issue of the journal Cell revealing that t ...
Dec 10, 2009 |
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Scientists solve puzzle of chickens that are half male and half female
A puzzle that has baffled scientists for centuries - why some birds appear to be male on one side of the body and female on the other - has been solved by researchers.
Mar 10, 2010 |
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Sex differences determined not simply by gender
(PhysOrg.com) -- Researchers at Imperial College London have uncovered an inherent difference in the way the genes of males or females can be "switched off" or silenced in the body's developing immune system. This finding ...
Sep 16, 2010 |
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Researchers discover mechanism that prevents two species from reproducing
Cornell researchers have discovered a genetic mechanism in fruit flies that prevents two closely related species from reproducing, a finding that offers clues to how species evolve.
Oct 26, 2009 |
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Genetic conflict in fish led to evolution of new sex chromosomes
University of Maryland biologists have genetically mapped the sex chromosomes of several species of cichlid (pronounced "sick-lid") fish from Lake Malawi, East Africa, and identified a mechanism by which new ...
Oct 01, 2009 |
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Unusual sex chromosome creates third sex in Hessian flies
(PhysOrg.com) -- Expectant human parents might wish for a boy or girl, but Hessian flies actually have a third option, and, no matter what, the flies are never surprised by the sex of their offspring.
Mar 30, 2010 |
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Men can rest easy -- sex chromosomes are here to stay
Fears that sex-linked chromosomes, such as the male Y chromosome, are doomed to extinction have been refuted in a new genetic study which examines the sex chromosomes of chickens.
May 08, 2012 |
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Platypus link to ovarian cancer
(PhysOrg.com) -- Researchers from the Royal Adelaide Hospital and University of Adelaide believe our oldest mammalian relative may help us to better understand ovarian cancer.
Jun 26, 2009 |
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Researchers to perform sex change operation on papaya
The complicated sex life of the papaya is about to get even more interesting, thanks to a $3.1 million grant from the National Science Foundation. The grant will fund basic research on the papaya sex chromosomes ...
Nov 02, 2009 |
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Researchers Use New Sequencing Strategies To Discover Rare Inherited Illness Rapidly
(PhysOrg.com) -- A team of researchers from the National Human Genome Research Institute (NHGRI) has demonstrated a new technical strategy that promises to rapidly determine the genetic cause for very rare inherited illnesses. ...
May 07, 2010 |
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First German genome comprehensively resolved at its molecular level
Max Planck researchers analyze the two chromosome sets in the human genome separately for the first time.
Sep 12, 2011 |
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Sex-determination system
A sex-determination system is a biological system that determines the development of sexual characteristics in an organism. Most sexual organisms have two sexes. In many cases, sex determination is genetic: males and females have different alleles or even different genes that specify their sexual morphology. In animals, this is often accompanied by chromosomal differences. In other cases, sex is determined by environmental variables (such as temperature) or social variables (the size of an organism relative to other members of its population). The details of some sex-determination systems are not yet fully understood.
For more information about Sex-determination system, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
