X chromosome

or X-chro·mo·some (ĕks′krō′mə-sōm′)

The sex chromosome associated with female characteristics in mammals, occurring paired in the female and single in the male.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

X chromosome

a sex chromosome of humans and most mammals that determines femaleness when paired with another X chromosome and that occurs singly in males. Compare Y chromosome.

[1910–15]

ThesaurusAntonymsRelated WordsSynonymsLegend:

Noun

X chromosome - the sex chromosome that is present in both sexes: singly in males and doubly in females; "human females normally have two X chromosomes"

sex chromosome - (genetics) a chromosome that determines the sex of an individual; "mammals normally have two sex chromosomes"

Translations

x chromosome

n. cromosoma x, cromosoma sexual diferencial que determina las características del sexo femenino.

English-Spanish Medical Dictionary © Farlex 2012

References in periodicals archive

Instead of having one X chromosome and one Y chromosome, as is typically male, or two X chromosomes, as is typically female, the child had two X's and a Y.

Family raises intersex child - again

Three weeks later, the pediatrician called Mark and his parents to tell them that the testing revealed that he had Klinefelter syndrome, or an extra X chromosome in a male.

Sex chromosome variations

The second model would reveal how an extra X chromosome affected the male mice.

Extra `girly` genes increase male sex drive

Clues to ancient interbreeding lie on the X chromosome, Reich and his coworkers say.

Hybrid-driven evolution: genomes show complexity of human-chimp split

The X chromosome is one of two sex chromosomes--gene-containing chemical structures--that determine whether you're born male or female.

Yoga: the secret to a great body...and better test scores?? (Lymphatic System/Blood Pressure)

Linkage studies of over 500 individuals from 60 families mapped the gene for XLA to the midportion (Xq22) of the X chromosome, cosegregating with the polymorphic genetic marker DXS 178 (87.88).

Comparative Genomics and Host Resistance against Infectious Diseases

In the case of one of them, the female fruit fly did indeed have a pair (an X chromosome and an X chromosome), but the male had one normal chromosome and a stub (an X chromosome and a Y chromosome).

Sex-linked characteristics

London, Mar 6 (ANI): A new study finds that what really makes a man is his expression of the lone X chromosome and the activity of a protein complex that gives enzymes on the chromosome an extra boost to increase gene expression.

It's not clothes, cars or scotch that make a man, but a protein!

London, Mar 3 (ANI): A new study finds that what really makes a man is his expression of the lone X chromosome and the activity of a protein complex that gives enzymes on the chromosome an extra boost to increase gene expression.

It's not clothes, cars or scotch that make a man, but a protein!

In 1992, Bryan Turner of the University of Birmingham Medical School in England and his colleagues discovered that the male fruit fly's single X chromosome, but not its other chromosomes or the female's two X chromosomes, has a specific acetylated amino acid on the tail of histone H4.

Code breakers: scientists tease out the secrets of proteins that DNA wraps around

Scientists at Penn State University (PSU) found that the male Y chromosome evolved at a much more rapid pace than X chromosome, which both males and females carry.

Male sex chromosome facing extinction due to rapid evolution