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Sex chromosome: The X chromosome or the Y chromosome, in humans. The sex chromosomes determine the sex of an individual. As a general rule, normal females have two X chromosomes while normal males have an X and a Y chromosome. The sex chromosomes evolved from an ancient pair of autosomal chromosomes. The X is considerably larger and richer in genes than the Y. The X contains 153 M bp (mega base pairs) and 1095 genes while the Y contains 50 M bp and 148 genes. The sex chromosomes, by convention, are the 23rd and last pair of chromosomes in a normal human karyotype.
Sex Chromosomes. The nuclei of human cells contain 22 autosomes and 2 sex chromosomes. In females, the sex chromosomes are the 2 X chromosomes. Males have one X chromosome ...
Library > Literature & Language > Dictionary n. Either of a pair of chromosomes, usually designated X or Y, in the germ cells of most animals and some plants, that ...
sex chromosome n. Either of a pair of chromosomes, usually designated X or Y, in the germ cells of most animals and some plants, that combine to determine the sex and ...
What is the relationship between chromosomes and sex? Sex is determined by the presence or absence of certain chromosomes.
sex chromosome (genetics), either of a pair of chromosomes that determine whether an individual is male or female. The sex chromosomes of human beings and other mammals ...