1. chromosome for the male gender. y chromosome the sex chromosome that is carried by men; "human males normally have one x chromosome and one y chromosome" [syn: y chromosome]. 2. the sex chromosome that is carried by men; "human males normally have one X chromosome and one Y chromosome". 3. A Y chromosome is the chromosome in a man's cells which will produce a male baby if it joins with a female's X chromosome. Y chromosomes are associated with male characteristics. Compare X chromosome. the part of a gene that makes someone a male instead of a female X chromosome.
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