X chromosome


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Related to X chromosome: Y chromosome

X chromosome

or X-chro·mo·some (ĕks′krō′mə-sōm′)
n.
The sex chromosome associated with female characteristics in mammals, occurring paired in the female and single in the male.

X chromosome


n.
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:
Noun1.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.
References in periodicals archive ?
The second model would reveal how an extra X chromosome affected the male mice.
The X chromosome may to many people connote femaleness, since women have a pair of X chromosomes and men have an X and a Y.
A gene that scientists have found to regulate X chromosome activity in mice doesn't work in people, report researchers from the Johns Hopkins Medical Institutions in Baltimore.
The reason female mammals bother inactivating an X chromosome is self-preservation.
Women typically have two X chromosomes, one inherited from each parent; men receive an X chromosome from their mother and a Y chromosome from their father.
Two new reports add to a growing body of evidence that an unusual gene called Xist may hold the key to X chromosome inactivation.
Page and his colleagues suggest that this finding is at odds with theories that the Y chromosome, once it started evolving separately from the X chromosome, only degenerated.
Two years ago, Hamer reported that men might inherit a predisposition to homosexuality through the X chromosome, whose genes are passed on by mothers (SN: 7/17/93, p.
Although researchers are still not sure exactly why this occurs, many assert that X inactivation initially arose to prevent the genetic inequity that would result if females had a double dose of active X chromosome genes.
Goodfellow of the Imperial Cancer Research Fund in London, England, and his colleagues have successfully moved a telomere -- the specialized structure that keeps the tips of chromosomes from unraveling -- up toward the center of the long arm of a mammalian X chromosome.
It involved a boy with hemophilia A, an inherited bleeding disorder caused by a defective gene on the X chromosome.
Several research teams had previously found the markers -- one for color blindness, the other for anemia -- among many people in other families with manic depression, and had proposed that as many as one in three manic depressives has a predisposing gene in that region of the X chromosome (SN: 3/28/87, p.