Y chromosome
The sex chromosome found together with an X chromosome in most normal males. Once thought to be a genetic wasteland, the Y now is known to contain at least 20 genes, some of them unique to the Y including the male-determining gene and male fitness genes that are active only in the testis and are thought responsible for the formation of sperm. Other genes on the Y have counterparts on the X chromosome, are active in many body tissues and play crucial "housekeeping" roles with the cell. As of the year 2000, a number of specific genes have been Y-linked including: {{}}ASMTY (which stands for acetylserotonin methyltransferase), TSPY (testis-specific protein), IL3RAY (interleukin-3 receptor), SRY (sex-determining region), TDF (testis determining factor), ZFY (zinc finger protein), PRKY (protein kinase, Y-linked), AMGL (amelogenin), CSF2RY (granulocyte-macrophage colony-stimulating factor receptor, alpha subunit on the Y chromosome), ANT3Y (adenine nucleotide translocator-3 on the Y), AZF2 (azoospermia factor 2), BPY2 (basic protein on the Y chromosome), AZF1 (azoospermia factor 1), DAZ (deleted in azoospermia), RBM1 (RNA binding motif protein, Y chromosome, family 1, member A1), RBM2 (RNA binding motif protein 2) and UTY (ubiquitously transcribed TPR gene on Y chromosome).

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Y chromosome 'wī- n a sex chromosome that is characteristic of male cells in species in which the male typically has two unlike sex chromosomes compare X CHROMOSOME

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a sex chromosome that is present in men but not in women; it is believed to carry the genes for maleness. Compare X chromosome.

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the sex chromosome present in male somatic cells, but not female, of organisms in which the male is the heterogametic sex, as in humans; it is carried by half the male gametes and none of the female gametes.

Medical dictionary. 2011.

Look at other dictionaries:

  • Y chromosome — Chromosome found only in the heterogametic sex. Thus in mammals the male has one Y chromosome and one X chromosome. One region of the Y chromosome, the pseudoautosomal region, is homologous to and pairs with the X chromosome. The primary… …   Dictionary of molecular biology

  • Y chromosome — Y chromosomes N COUNT A Y chromosome is the chromosome in a man s cells which will produce a male baby if it joins with a female s X chromosome. Y chromosomes are associated with male characteristics. Compare X chromosome …   English dictionary

  • Y-chromosome — Y chro·mo·some or Y chromosome (wīʹkrōʹmə sōm ) n. The sex chromosome associated with male characteristics in mammals, not occurring in females and occurring with one X chromosome in the male sex chromosome pair. * * * …   Universalium

  • Y chromosome — ► NOUN Genetics ▪ (in humans and other mammals) a sex chromosome which is normally present only in male cells, which are designated XY. Compare with X CHROMOSOME(Cf. ↑X chromosome) …   English terms dictionary

  • Y chromosome — n. see SEX CHROMOSOME …   English World dictionary

  • Y chromosome — Human Y chromatid The Y chromosome is one of the two sex determining chromosomes in most mammals, including humans. In mammals, it contains the gene SRY, which triggers testis development if present. The human Y chromosome is composed of about 60 …   Wikipedia

  • Y-chromosome — n. a sex chromosome occurring only in male cells. Etymology: Y as an arbitrary label + CHROMOSOME * * * Y chromosome see under ↑Y (symbol). Yˈ chromosome noun One of a pair of chromosomes associated with sex determination in mammals (the other… …   Useful english dictionary

  • Y-chromosome — UK / US noun [countable] Word forms Y chromosome : singular Y chromosome plural Y chromosomes biology a type of chromosome (= genetic material in a cell) that is only found in human or animal males See: X chromosome …   English dictionary

  • Y chromosome — noun the sex chromosome that is carried by men human males normally have one X chromosome and one Y chromosome • Hypernyms: ↑sex chromosome …   Useful english dictionary

  • Y chromosome — Y chro|mo|some [ˈwaı ˌkrəuməsəum US ˌkrouməsoum] n the part of a ↑gene that makes someone a male instead of a female →↑X chromosome …   Dictionary of contemporary English

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