Definitions for y chromosome
Random House Webster's College Dictionary
a sex chromosome of humans and most mammals that is present only in males and is paired with anXchromosome.
Ref: Compare X chromosome.
Origin of Y chromosome:
the sex chromosome that is carried by men
"human males normally have one X chromosome and one Y chromosome"
A mammalian sex chromosome, occurring only in male cells. Cells of females have a pair of X chromosomes while cells of males have an X and a Y.
U.S. National Library of Medicine
The male sex chromosome, being the differential sex chromosome carried by half the male gametes and none of the female gametes in humans and in some other male-heterogametic species in which the homologue of the X chromosome has been retained.
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