Sex Chromosomes
| Definition: |
The homologous chromosomes that are dissimilar in the heterogametic sex. There are the X CHROMOSOME, the Y CHROMOSOME, and the W, Z chromosomes (in animals in which the female is the heterogametic sex (the silkworm moth Bombyx mori, for example)). In such cases the W chromosome is the female-determining and the male is ZZ. (From King & Stansfield, A Dictionary of Genetics, 4th ed) |
| Notes: |
X chromosome /abnorm = SEX CHROMOSOME ABERRATIONS (IM) + X CHROMOSOME (IM); Y chromosome /abnorm = SEX CHROMOSOME ABERRATIONS (IM) + Y CHROMOSOME (IM); A 11 qualif except /cytol /transpl; /genet permitted |
| Previously Indexed: |
Chromosomes (1966-1967),Sex Chromatin (1966-1967) |
Sex Chromosomes Categories.
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Sex Chromatin - In the interphase nucleus, a condensed mass of chromatin representing an inactivated X chromosome. Each X CHROMOSOME, in excess of one, forms sex chromatin (Barr body) in the mammalian nucleus. (from King & Stansfield, A Dictionary of Genetics, 4th ed) |
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X Chromosome - The female sex chromosome, being the differential sex chromosome carried by half the male gametes and all female gametes in human and other male-heterogametic species. |
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Y Chromosome - The male sex chromosome, being the differential sex chromosome carried by half the male gametes and none of the female gametes in humans and in some other male-heterogametic species in which the homologue of the X chromosome has been retained. |
Sex Chromosomes Definitions and Terms
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