http://www.physorg.com/ en-us Physorg.com internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine. 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 sex chromosomes may evolve. http://www.physorg.com/news173626987.html Biology Thu, 01 Oct 2009 15:30:14 EST news173626987 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 processes that control this chromosome's demise. http://www.physorg.com/news167026463.html Biology Fri, 17 Jul 2009 05:15:21 EST news167026463 (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. http://www.physorg.com/news165241632.html Medicine & Health Fri, 26 Jun 2009 13:50:01 EST news165241632 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. The study shows that for at least one lizard species, egg size matters. http://www.physorg.com/news163342512.html Biology Thu, 04 Jun 2009 13:56:04 EST news163342512 Incipient sex chromosomes have been found in New Zealand's eponymous export, the kiwifruit. Researchers writing in the open access journal BMC Genomics have mapped the kiwifruit genome and pin-pointed the sex-determining locus. http://www.physorg.com/news155845594.html Biology Mon, 09 Mar 2009 19:27:03 EST news155845594 Research from the University of Pittsburgh published in the Nov. 20 edition of Heredity could finally provide evidence of the first stages of the evolution of separate sexes, a theory that holds that males and females developed from hermaphroditic ancestors. These early stages are not completely understood because the majority of animal species developed into the arguably less titillating separate-sex state too long ago for scientists to observe the transition. http://www.physorg.com/news146420175.html Biology Thu, 20 Nov 2008 16:16:15 EST news146420175