Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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Multi-word Results
sex chromosome either of two sex-determining chromosomes, designated X and Y, in the reproductive cells of human beings, most animals, and some plants.
X chromosome the sex chromosome that occurs paired in females and singly in males, and is responsible for female sex characteristics. (Cf. Y chromosome.)
Y chromosome a sex chromosome that occurs only in males, paired with an X chromosome, and is responsible for male sex characteristics. (Cf. X chromosome.)