Sex Chromosome - definition

Sex Chromosome - definition

Sex Chromosome - the structure of GENETIC CODE that determines gender (male or female). The male sex CHROMOSOME has the appearance of the letter Y and the female sex chromosome has the appearance of the letter X. A combination of XY results in male and a combination of XX results in female. The Y chromosome contains fewer than 100 genes, while the X chromosome carries several hundred genes. A number of GENETIC DISORDERS are X-linked that is, they result from mutations that occur among genes the X chromosome carries. HEMOPHILIA and some forms of MUSCULAR DYSTROPHY (notably Duchenne’s and Becker’s) are X-linked genetic disorders.

See also AUTOSOME; GAMETE; GENE; MUTATION; SOMATIC CELL.

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Genetics and Molecular Medicine

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