a sex chromosome of humans and most mammals that is present only in males and is paired with an X chromosome.
Compare X chromosome.
Origin of Y chromosome
First recorded in 1920–25
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The sex chromosome associated with male characteristics, occurring with one X-chromosome 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.
The sex chromosome that is paired with an X-chromosome in males. Most of the genes on the X-chromosome determine physical attributes associated with males, such as the development of testes. See more at sex chromosome. See Note at sex.
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