(In humans and other mammals) a sex chromosome which is normally present only in male cells, which are designated XY. Compare with X chromosome.
- If a gene on the Y chromosome mutates, that piece of the male genetic code may disappear.
- Genes in the second group are expressed exclusively in testes and form gene families on the Y chromosome.
- Bone marrow derived cells were identified by the presence of the Y chromosome, ordinarily found only in males.
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