Loading...



  • Translocations
  • In Boston, USA 55% of 47,XYY boys (6 of 11) identified in a newborn screening program had learning difficulties and received part-time resource room help compared to 11% (1 of 9) in an above-average-IQ control group of 46,XY boys with familial balanced autosomal chromosome translocations. (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)
  • 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)
  • differences
  • Up until now, it has been impossible to separate the influence of sex chromosomes from the effects of sex hormones, and in this paper, we have shown for the first time that sex chromosomes are impacting blood pressure - independent of sex hormones," says the study's lead investigator, Kathryn Sandberg, PhD, director of the GUMC Center for the Study of Sex Differences in Health, Aging, and Disease. (medindia.net)
  • 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)
  • 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)
  • females
  • Although androgens are commonly thought of only as male sex hormones, females also have them, but at lower levels: they function in libido and sexual arousal. (wikipedia.org)
  • sperm
  • The mesoderm-derived epithelial cells of the sex cords in developing testes become the Sertoli cells, which will function to support sperm cell formation. (wikipedia.org)
  • Female sperm can be either: A sperm that contains an X chromosome, produced in the usual way by a male, referring to the occurrence of such a sperm fertilizing an egg and giving birth to a female. (wikipedia.org)
  • Since the late 1980s, scientists have explored how to produce sperm where all of the chromosomes come from a female donor. (wikipedia.org)
  • In 2007, a patent application was filed on methods for creating human female sperm using artificial or natural Y chromosomes and testicular transplantation. (wikipedia.org)
  • If created, a "female sperm" cell could fertilize an egg cell, a procedure that, among other potential applications, might enable female same-sex couples to produce a child that would be the biological offspring of its two mothers. (wikipedia.org)
  • female
  • Another possible combination includes the presence of all three sex-linked genes (male suppressing, female suppressing, and male promoting) which produce virile male offspring. (wikipedia.org)
  • individual
  • They all share the same position onthe chromosome but only two can occupy the position in any particular individual bird. (blogspot.com)
  • The different combinations of possible sex-related genes that an individual Silene can have in one Y chromosome are what creates the rich variation of sexual phenotypes throughout this genus. (wikipedia.org)
  • In a normal situation, all the cells in an individual will have 46 chromosomes with one being an X and one a Y or with two Xs. (wikipedia.org)
  • different
  • Different combinations of the genes present in a Silene Y chromosome affect the sexual expression in the organism. (wikipedia.org)
  • In the cell nucleus, it seems that promoters are distributed preferentially at the edge of the chromosomal territories, likely for the co-expression of genes on different chromosomes. (wikipedia.org)
  • However, in Drosophila paulistorum there is information suggesting that if Y chromosome and cytoplasm are from different parents, the male is usually sterile. (wikipedia.org)
  • male
  • Contrastingly, recombination is suppressed across most of the Y chromosomes during pairing in male meiosis (XY). (wikipedia.org)
  • This includes the embryological development of the primary male sex organs, and the development of male secondary sex characteristics at puberty. (wikipedia.org)
  • develop
  • At about week 6, epithelial sex cords develop within the forming testes and incorporate the germ cells as they migrate into the gonads. (wikipedia.org)
  • results
  • Previous Y-chromosome results showed a Levantine coastal-inland contrast marked by J1 and J2, and a very strong North African component was evident throughout the Middle East. (blogspot.com)
  • study
  • Sex Speeds Up Evolution, Study Finds (URL accessed on January 9, 2005) Dawkins, R. (2005), The Ancestor's Tale: A Pilgrimage to the Dawn of Evolution, Houghton Mifflin Harcourt, ISBN 978-0-618-61916-0 "Proterospongia is a rare freshwater protist, a colonial member of the Choanoflagellata. (wikipedia.org)
  • presence
  • Because of the presence of dysgenetic gonadal tissue and Y chromosome material, there is a high risk of the development of a gonadoblastoma. (wikipedia.org)
  • studies
  • The common inference drawn from such studies is that the sex of the offspring is determined by the Y chromosome. (wikipedia.org)
  • Several studies concentrated on Silene latifolia have shown a correlation between loci on the Y chromosome and the sex that is expressed phenotypically in the flower. (wikipedia.org)
  • human
  • https://www.theguardian.com/science/2017/jun/07/oldest-homo-sapiens-bones-ever-found-shake-foundations-of-the-human-story "'Experiments with sex have been very hard to conduct,' Goddard said. (wikipedia.org)
  • pattern
  • While J2 has penetrated into Europe, the pattern of Y-chromosome diversity in Lebanon does not show the widespread affinities with Europe indicated by the mtDNA data. (blogspot.com)