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sex chromosome |
Also found in: Dictionary/thesaurus, Medical, Legal, Wikipedia, Hutchinson | 0.01 sec. |
sex chromosomeEither of a pair of chromosomes that determine whether an individual is male or female. The sex chromosomes of mammals are designated X and Y; in humans, they constitute one pair of the total 23 pairs of chromosomes. Individuals possessing two X chromosomes (XX) are female; those having one X and one Y chromosome (XY) are male. The X chromosome is larger and carries more genetic information than the Y. Traits controlled only by genes found on the X chromosome (e.g., hemophilia, red-green colour blindness) are said to be sex-linked. Sex-linked traits occur far more frequently in males than in females, since a male inheriting an allele for a recessive (see recessiveness) trait on the X chromosome lacks a corresponding allele on the Y chromosome that might counteract its effects. Several disorders are associated with an abnormal number of sex chromosomes, including Turner syndrome and Klinefelter syndrome. sex chromosome either of the chromosomes determining the sex of animals sex chromosome [′seks ‚krō·mə‚sōm] (genetics) Either member of a pair of chromosomes responsible for sex determination of an organism. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| ? Mentioned in | ? References in periodicals archive | ||
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| The doubling of sex chromosomes that occurs in this kind of asexual reproduction creates males among reptiles. The diploid chromosome number of Z infestans is 22, including 10 pairs of autosomes and 1 pair of sex chromosomes (XY in males, XX in females) (8). In addition, the second and the third main aneuploidies found in our study included both sex chromosomes (XY-18 and XY-18,18). |
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