Sex Chromosomes Current Events | Sex Chromosomes News
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A new explanation for evolutionary changes in genetic sex-determination systems
In animals with separate sexes, embryos commit to becoming male or female at an early stage. Often this key decision is made by sex determination genes on the sex chromosomes. The genes involved in sexual development have changed remarkably little during evolution. In contrast, the sex determination genes and the sex chromosomes themselves are... view more... (2007-10-22)
Double identities lie behind chromosome disorders
Chromosome disorders in sex cells cause infertility, miscarriage and irregular numbers of chromosomes (aneuploidy) in neonates. A new study from Karolinska Institutet published in the scientific journal Nature Genetics shows how chromosome disorders can arise when sex cells are formed. view more (2007-07-09)
How do you know whether you are male or female?
New research published online this week in the open-access journal PLoS Biology investigates this basic and much-studied question in the fruit fly, and comes to a surprising new conclusion. view more (2007-12-27)
Fungi can tell us about the origin of sex chromosomes
Fungi do not have sexes, just so-called mating types. A new study being published today in the prestigious journal PLoS shows that there are great similarities between the parts of DNA that determine the sex of plants and animals and the parts of DNA that determine mating types in certain fungi. view more (2008-03-18)
Evolution of genomic imprinting
How we come to express the genes of one parent over the other is now better understood through studying the platypus and marsupial wallaby - and it doesn't seem to have originated in association with sex chromosomes. view more (2007-09-07)
Sex hormone signature indicates gender rather than just chromosomes
Help with assigning gender could one day be at hand for intersex individuals whose genital phenotypes and sex chromosomes don't match, thanks to the discovery of a stable sex hormone signature in our cells. view more (2007-10-18)
Geneticists Determine The Lack Of Chromosomes
A healthy person's genome contains 46 chromosomes, but an individual cell can contain less. Contemporary methods allow to determine the value of losses rather accurately. The Tomsk researchers' effort has been supported by the Russian Foundation for Basic Research. An average statistical cell of a healthy person contains 46 chromosomes. But a... view more... (2004-06-15)
East African cichlid fish offer new understanding of genetic basis of sex determination
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. view more (2009-10-02)
Two From One-Pitt Research Maps Out Evolution of Genders From Hermaphroditic Ancestors
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. view more (2008-11-21)
Geneticists tell ostrich farmers the secrets of sex
Research published in the online journal, BMC Biotechnology reports on a new, large-scale technique for distinguishing between male and female ostrich chicks using DNA extracted from feathers. This new technique will remove the need for invasive procedures currently in use to sex-type ostriches and allow breeders to discover the sex of their... view more... (2002-10-16)
Fruit fly gene research may shed light on human disease processes
Those small fruit flies buzzing around your bananas are more than pests—they may be allies in a fruitful search for clues to human diseases caused when genes malfunction. view more (2007-03-28)
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 sex chromosomes may evolve. view more (2009-10-02)
Yeast missing sex genes undergo unexpected sexual reproduction
An emerging form of the pathogenic yeast Candida is able to complete a full sexual cycle in a test tube, even though it's missing the genes for reproduction. view more (2009-05-26)
The story of X -- evolution of a sex chromosome
In the first evolutionary study of the chromosome associated with being female, University of California, Berkeley, biologist Doris Bachtrog and her colleagues show that the history of the X chromosome is every bit as interesting as the much-studied, male-determining Y chromosome, and offers important clues to the origins and benefits of sexual... view more... (2009-04-17)
Molecular Biologists Reveal Historical Secrets
By analysing DNA from ancient human remains researchers can determine the sex and ethnicity of our ancestors and help historians to compose a complete picture of their life and customs. In the region of Altai Mountains archaeologists discovered remains of an ancient civilisation. During excavations, they found many bones of newborns and wondered... view more... (2002-07-05)
Sex talk revelations of the lonely Y chromosome
In the week that the University of Leicester celebrates the 25th anniversary of the discovery of DNA fingerprinting new findings from the world-renowned University of Leicester Department of Genetics reveal for the first time that the male and female do truly communicate -at least at the fundamental genetic level. view more (2009-09-11)
Researchers shed light on shrinking of chromosomes
A human cell contains an enormous 1.8 metres of DNA partitioned into 46 chromosomes. view more (2007-06-12)
New clues to how sex evolves
Sex is a boon to evolution; it allows genetic material from parents to recombine, giving rise to a unique new genome. But how did sex itself evolve\\\ view more (2006-12-05)
Enzyme necessary for DNA synthesis can also erase DNA
In this week's edition of Proceedings of the National Academy of Sciences, PNAS, Uppsala University scientists describe a new mechanism behind an important process that causes a rapid reduction of DNA in the chromosomes of bacteria. view more (2009-06-09)
War between the sexes influences evolution in some species, say scientists
Competition and conflict between males and females start inside the egg in some species, say scientists. view more (2006-04-07)
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