X chromosome

noun

: a sex chromosome that usually occurs paired in each female cell and single in each male cell in species in which the male typically has two unlike sex chromosomes compare y chromosome

Examples of X chromosome in a Sentence

Recent Examples on the Web
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Two independent studies published on May 15 by geneticists in Japan and from Stanford University in California explain how orange cats' coloring is a direct result of a missing DNA code near a specific protein found within the X chromosome. Greta Cross, USA Today, 17 May 2025 Sasaki and his team decided to sequence the whole genomes of cats with different coat colors to single out any variations on the X chromosome. Gayoung Lee, Scientific American, 15 May 2025 Someone with Klinefelter syndrome, for instance, may be assigned male at birth but has an extra copy of the X chromosome (XXY) rather than the typical XY. Claire Bugos, Verywell Health, 26 Feb. 2025 Those with two X chromosomes and ovaries lived longest, followed by mice with two X chromosomes and testes. Mohana Ravindranath, New York Times, 25 Feb. 2025 See All Example Sentences for X chromosome

Word History

First Known Use

1911, in the meaning defined above

Time Traveler
The first known use of X chromosome was in 1911

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Cite this Entry

“X chromosome.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/X%20chromosome. Accessed 24 May. 2025.

Kids Definition

X chromosome

noun
: a sex chromosome that is associated with femaleness and usually occurs paired in each female cell and single in each male cell in organisms (as human beings) in which the male normally has two unlike sex chromosomes compare y chromosome

Medical Definition

X chromosome

noun
: a sex chromosome that usually occurs paired in each female cell and single in each male cell in species in which the male typically has two unlike sex chromosomes compare y chromosome

More from Merriam-Webster on X chromosome

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