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Found Y chromosome 1 time.

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1. Y chromosome
A sex chromosome found in humans, fruit flies, and certain other animals where the male is the heterogametic sex . The Y chromosome causes the individual to become male in most mammal species and carries few other gene s besides those dictating sperm development and triggering appropriate hormonal output. It is part of the XY set of sex chromosomes, where the male has only one X chromosome and usually a Y chromosome (fruit fly males can also have just one X and nothing else), and the female has two X chromosomes.

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