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noun, Genetics.
a chromosome, differing in shape or function from other chromosomes, that determines the sex of an individual.
sex chromosome
either of the chromosomes determining the sex of animals See also X-chromosome, Y-chromosome

sex chromosome n.
Either of a pair of chromosomes, usually designated X or Y, that combine to determine the sex and sex-linked characteristics of an individual, with XX resulting in a female and XY in a male.
sex chromosome
Either of a pair of chromosomes, usually called X and Y, that in combination determine the sex of an individual in many animals and in some plants. In mammals, XX results in a female and XY in a male, while the opposite is true in birds (where the designations ZW for female and ZZ for male are often used). Sex chromosomes carry the genes that control the development of reproductive organs and secondary sex characteristics. In some organisms, sex is determined by environmental influences. See also X-chromosome, Y-chromosome.


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  • Sex-crime

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  • Sexdecillion

    [seks-di-sil-yuh n] /ˌsɛks dɪˈsɪl yən/ noun, plural sexdecillions (as after a numeral) sexdecillion. 1. a cardinal number represented in the U.S. by 1 followed by 51 zeros, and in Great Britain by 1 followed by 96 zeros. adjective 2. amounting to one sexdecillion in number.

  • Sex determination

    sex determination n. The determination of the sex of a fetus by identifying sex chromatin in amniotic fluid obtained by amniocentesis.

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