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Last updated on April 16, 2014 at 7:25 EDT

Latest Sex-determination system Stories

2014-03-27 13:07:49

Results help explain puzzling features of 'dot chromosome' In previous research, UC Berkeley scientists Beatriz Vicoso, Ph.D., and Doris Bachtrog, Ph.D., determined that genes on the so-called "dot chromosome," or fourth chromosome, of the fruit fly Drosophilia melanogaster are X-linked in three other related fly species. These and other findings revealed that the fruit fly's "dot chromosome" had descended from a differentiated X chromosome and suggests that several of the chromosome's...

Y Chromosome Not Going To Disappear
2014-01-10 10:40:58

Brett Smith for redOrbit.com - Your Universe Online Finally, some good news for men, as a new study in PLOS Genetics has found that the human race may not be losing the Y chromosome after all. Some popular theories have posited that the male sex chromosome is destined to diminish and disappear. "The Y chromosome has lost 90 percent of the genes it once shared with the X chromosome, and some scientists have speculated that the Y chromosome will disappear in less than 5 million years,"...

Genetics Of Male Gender Identity
2013-09-03 12:12:52

Brett Smith for redOrbit.com - Your Universe Online New research from scientists at Case Western University indicates that the development of gender in human males is somewhat tenuous and could point to a biological mechanism behind a spectrum of gender identities. In the study, which was published in Proceedings of the National Academy of Sciences, scientists recruited volunteers from rare families in which a daughter has the same Y chromosome as her father. All fetuses start...

Chinese Alligator Genome Sequencing Complete
2013-08-10 05:29:43

April Flowers for redOrbit.com - Your Universe Online Scientists from Zhejiang University in China and  BGI Shenzhen have completed and analyzed the genomic sequence of the endangered Chinese alligator (Alligator sinensis) – the first published crocodilian genome. The findings, published in Cell Research, provide plausible explanations of how terrestrial reptiles adapt to aquatic environments and temperature-dependent sex determination (TSD). The Chinese alligator is critically...

Herd Fertility May Be Improved By Understanding The Gene-rich Y Chromosomes Of Bulls
2013-07-11 15:24:22

Penn State The Y chromosomes of cattle have more genes and are more active than the Y chromosomes of other primates, according to researchers. This discovery may help biologists better understand how cattle and other mammals evolved, as well as help animal breeders and farmers better maintain and enhance fertility in the cattle industry, said Wansheng Liu, associate professor of animal genomics, Penn State. "Low fertility is a big problem for the dairy and beef industry," Liu said....

A Look At The Early Evolution Of Sex Chromosomes
2012-08-06 18:24:30

Two new studies offer insight into sex chromosome evolution by focusing on papaya, a multimillion dollar crop plant with a sexual problem (as far as growers are concerned) and a complicated past. The findings are described in two papers in the Proceedings of the National Academy of Sciences. The research reveals that the papaya sex chromosomes have undergone dramatic changes in their short evolutionary histories (they are about 7 million years old; by comparison, human sex chromosomes...

2011-10-07 12:20:24

New findings of researchers from the University of Modena and Reggio Emilia (Mauro Mandrioli, Valentina Monti and Gian Carlo Manicardi) show that in aphids the two X chromosomes have a different inheritance. The study was published in Comparative Cytogenetics. Aphids are insects with a sex determination model based on the presence of two X chromosomes (XX) in females and a single X chromosome (XO) in males. Previous studies suggested that X chromosome loss during male determination was...

2010-03-16 16:00:02

Male mice born with female sex chromosomes experience hypertension seen in postmenopausal women Washington, DC "“ Researchers at Georgetown University Medical Center (GUMC) have determined that something in female sex chromosomes appears to trigger a rise in blood pressure after the onset of menopause. This finding challenges the current belief that sex hormones are largely responsible for regulating blood pressure. Their work, reported online Monday in Hypertension, is the first of its...

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2009-11-02 10:27:46

New insights into the biology of the platypus and echidna have been published, providing a collection of unique research data about the world's only monotremes. University of Adelaide geneticist Dr Frank Grtzner and his team have authored five of 28 papers which appear in two special issues of the Australian Journal of Zoology and Reproduction Fertility and Development. The articles shed new light on the extraordinary complex platypus sex chromosome system. "For the first time we have looked...

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2009-10-03 09:44:55

Diversity of fish in East African lakes points to mechanism for evolution of sex chromosomes Biologists have genetically mapped the sex chromosomes of several species of cichlid fish from Lake Malawi, East Africa, and identified a mechanism by which new sex chromosomes may evolve. In research published in this week's issue of the journal Science, biologists Thomas Kocher, Reade Roberts and Jennifer Ser of the University of Maryland describe the genetic basis for two co-existing systems of...