Y chromosome

American  

noun

Genetics.

1. a sex chromosome of humans and most mammals that is present only in males and is paired with an X chromosome.

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Y-chromosome British  

noun

1. the sex chromosome that occurs as one of a pair with the X-chromosome in the diploid cells of the males of many animals, including humans Compare X-chromosome

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Y-chromosome Scientific  

1. 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.

2. See more at sex chromosome See Note at sex

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Etymology

Origin of Y chromosome

First recorded in 1920–25

Example Sentences

As men grow older, some of their cells gradually lose the Y chromosome.

From Science Daily

If the test is negative for the Y chromosome - ie it is absent - the athlete is eligible to compete in the female category.

From BBC

The test for the SRY gene - which is part of the Y chromosome and causes male characteristics to develop - can be conducted via a cheek swab or blood test.

From BBC

Chromosomes are larger sections of DNA, and male cats like other mammals have an X and a Y chromosome, which carry different amounts of genes.

From BBC

One relates to the presence or absence of the Y chromosome.

From Salon