• 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)
  • males
  • The female has two X chromosomes, and all female egg cells normally carry a single X. The eggs fertilized by X-bearing sperm become females (XX), whereas those fertilized by Y-bearing sperm become males (XY). (britannica.com)
  • The Y chromosome, which is found only in males, is difficult to decode even with the latest sequencing technologies. (phys.org)
  • The sex chromosome that only males carry is deteriorating and could disappear within a few million years, new research has warned. (medindia.net)
  • Results from several decades of long-term follow-up of scores of unselected XYY males identified in eight international newborn chromosome screening studies in the 1960s and 1970s have replaced pioneering but biased studies from the 1960s (that used only institutionalized XYY men), as the basis for current understanding of the XYY genotype and established that XYY males are characterized by increased height but are not characterized by aggressive behavior. (wikipedia.org)
  • Any chromosome region, either in males or females, that is asynapsed is subject to meiotic silencing. (wikipedia.org)
  • By contrast, the allosome pair consists of two X chromosomes in females or one X and one Y chromosome in males. (wikipedia.org)
  • Klinefelter syndrome (KS) also known as 47,XXY or XXY, is the set of symptoms that result from two or more X chromosomes in males. (wikipedia.org)
  • 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)
  • translocations
  • Surprisingly, they've shown that these crucial translocations occurred at the centromeres, the twisty ties that hold together chromosomes at the center of an x-shaped pair. (duke.edu)
  • According to their model, multiple translocations deposited the two sex determinants on the same chromosome, with a centromere in between. (duke.edu)
  • autosomes
  • The other 22 pairs of chromosomes are called autosomes . (britannica.com)
  • This was when one of the autosomes mutated and acquired the SRY gene -- Sex-determining Region Y -- which is the master switch for creating a male. (abc.net.au)
  • All human autosomes have been identified and mapped by extracting the chromosomes from a cell arrested in metaphase or prometaphase and then staining them with some sort of dye (most commonly, Giemsa). (wikipedia.org)
  • organism's
  • 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)
  • 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)
  • fungi
  • But with some fungi and other microbes, sex can be a lot more complicated. (phys.org)
  • evolve
  • Our results support a model in which cis -acting regulatory sites for dosage compensation evolve on a neo- X chromosome arm in response to the degeneration of its former homologue. (genetics.org)
  • mechanisms
  • However, the rate of turnover of sex-determining mechanisms is notably different among particular vertebrate lineages. (royalsocietypublishing.org)
  • As poikilotherms, reptiles (the term 'reptiles' denotes here the paraphyletic group, i.e. sauropsids with the exclusion of their inner avian group) are usually considered as a group with a rapid turnover of sex-determining mechanisms [ 4 , 5 ] and as a whole, they indeed exhibit a large variability in sex-determining systems [ 6 , 7 ]. (royalsocietypublishing.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)
  • ancestral
  • In this study, the researchers showed that in Cryptococcus amylolentus, the ancestral state, the P/R locus resided on chromosome 10 and the HD locus on chromosome 11. (duke.edu)
  • 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)
  • 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)
  • 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)
  • 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)
  • found
  • Despite this milestone not the XXY syndrome but the XYY syndrome is instead sometimes called Jacobs syndrome: After it had been incidentally discovered by Avery Sandberg in 1961, the syndrome was also found in a chromosome survey of 315 men at a hospital for developmentally disabled, made by Jacobs and hence considered the first little research on it. (wikipedia.org)
  • infertility
  • 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)