• female sex
  • Something in female sex chromosomes appears to trigger a rise in blood pressure after the onset of menopause, says a study by Georgetown University Medical Center (GUMC) scientists. (medindia.net)
  • He found that the orange blotch (OB) allele that produces the variable pigmentation in females was dominant over the "brown barred" (BB) allele (that produces the more common brown pigmentation) and that it was located very near a female sex determiner. (medindia.net)
  • mechanism
  • These birds have lateralised brain structures in the face of a common steroid signal, providing strong evidence for a non-hormonal primary sex mechanism regulating brain differentiation. (wikipedia.org)
  • The crossover of genetic material also provides a possible defence against 'chromosome killer' mechanisms, by removing the distinction between 'self' and 'non-self' through which such a mechanism could operate. (wikipedia.org)
  • Turner's
  • Ford CE, Jones KW, Polani PE, deAlmeida JC and Briggs JH (1959a) A sexchromosome anomaly in a case of gonadal dysgennesis (Turner's syndrome). (els.net)
  • Klinefelter
  • In contrast to the other common sex chromosome aneuploidies-47,XXX and 47,XXY (Klinefelter syndrome)-the average IQ scores of 47,XYY boys identified by newborn screening programs were not reduced compared to the general population. (wikipedia.org)
  • male
  • individuals having one X chromosome and one Y chromosome (XY) are male. (britannica.com)
  • This is because the male who inherits the recessive allele on his X chromosome has no allele on his Y chromosome to counteract its effects. (britannica.com)
  • Published in Hypertension, the research is the first of its kind and involves male mice engineered to have female (XX) sex chromosomes, and female mice with male (XY) chromosomes. (medindia.net)
  • We will concentrate on a group of patients (both male and female) with known Y-chromosome variations and infertility previously identified by our collaborator, Dr. David Page s lab. (clinicaltrials.gov)
  • XYY syndrome is a genetic condition in which a male has an extra Y chromosome. (wikipedia.org)
  • This leads to one of the two cells having sex chromosomes that cause male development and the other cell having chromosomes that cause female development. (wikipedia.org)
  • Professor Ben Barres (born 1955), a neurobiologist at Stanford University Medical School who transitioned from female to male, has spoken of his scientific achievements having been perceived differently, depending on his sex at the time. (wikipedia.org)
  • mitosis
  • In some cases, the addition of an extra Y-chromosome results from nondisjunction during cell division during a post-zygotic mitosis in early embryonic development. (wikipedia.org)
  • For example, an XY cell undergoing mitosis duplicates its chromosomes, becoming XXYY. (wikipedia.org)
  • Plants
  • Charles Elmer Allen (October 4, 1872 in Horicon, Wisconsin - June 25, 1954) was an American botanist and cell biologist whose discoveries include the first documentation of sex chromosomes in plants. (wikipedia.org)
  • hormones
  • The finding challenges the current belief that sex hormones are largely responsible for regulating blood pressure. (medindia.net)
  • Most researchers have thought that sex hormones (estrogen and testosterone) play key roles in controlling blood pressure and that women develop hypertension after reaching menopause because of loss of estrogen. (medindia.net)
  • That is not to say sex hormones don't matter in blood pressure regulation, because they do, but we now know they aren't the only players," she says. (medindia.net)
  • week's
  • Research published in this week's Science reveals that the Y chromosome developed from an X-like ancestor around 300 million years ago. (abc.net.au)
  • time
  • On the contrary, the length of the W chromosome can fluctuate over short time scales, probably involving both shortening and elongation of non-coding regions. (royalsocietypublishing.org)
  • PhysOrg.com) -- Move over, Y chromosome - it's time X got some attention. (phys.org)
  • Her crucial studies of mealworms revealed for the first time that an organism's sex is determined by its chromosomes rather than by environmental or other factors. (wikipedia.org)