x-chromosome

X chromosome

noun Genetics.
a sex chromosome of humans and most mammals that determines femaleness when paired with another X chromosome and that occurs singly in males.
Compare Y chromosome.


Origin:
1910–15

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Collins
World English Dictionary
X-chromosome
 
n
Compare Y-chromosome the sex chromosome that occurs in pairs in the diploid cells of the females of many animals, including humans, and as one of a pair with the Y-chromosome in those of males

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American Heritage
Medical Dictionary

X-chromosome n.
The sex chromosome associated with female characteristics, occurring paired in the female and singly in the male sex-chromosome pair.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
X-chromosome   (ěks'krō'mə-sōm')  Pronunciation Key 
The sex chromosome that in female mammals is paired with another X-chromosome and in males is paired with a Y-chromosome. Very few genes on the X-chromosome have counterparts on the Y-chromosome, and since males have only one X-chromosome, any gene present on it (even if the gene is recessive in females) is expressed in males. In females, one of the two X-chromosomes in each cell is deactivated. See more at sex chromosome. See note at sex.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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