For X Chromosome we have terms and definitions in 10 topics. The topics are Anthromorphemics, Anthropology, Bioinformatics, Gene Testing, Genetics and Genealogy, Genome, HIV and AIDs, Huntingtons Disease, Medical and Science.

X Chromosome (Anthromorphemics)

The larger of the two sex chromosomes. Normal females possess two X chromosomes; normal males possess one X and one Y chromosome.

X Chromosome (Anthropology)

The larger of the two sex chromosomes. Normal females possess two X chromosomes; normal males possess one X and one Y chromosome.

X Chromosome (Bioinformatics)

In mammals, the sex chromosome that is found in two copies in the homogametic sex (female in humans) and one copy in the hererogametic sex (male in humans).

X Chromosome (Gene Testing)

A sex chromosome; normal females carry two X chromosomes.

X Chromosome (Genetics and Genealogy)

One of the two types of sex determining chromosomes. The unfertilized egg cell always is created with one X chromosome in the haploid of the human diploid in the unfertilized egg cell. The other sex chromosome is provided by the male’s sperm cell. An X chromosome with the haploid in the sperm cell from the male and the fertilized egg produces a female offspring. A Y chromosome with the haploid in the sperm cell from the male and the fertilized egg produces a male offspring. Thus the Y chromosome is passed from fathers to sons. It should be noted that the X chromosome is much larger than its Y chromosome counterpart. Also, when the two X chromosomes, one from each parent, are paired with each other in a fertilized egg cell, and thus ultimately producing a female offspring, these two X chromosomes are of equal size and are thus homologous in the female offspring. Thus the X chromosomes become subject to cross-over effects during subsequent egg cell creation in the offspring, and thus the homologous gene alleles and genetic marker alleles in both those X chromosomes can randomly swap positions in the next generations making it very difficult to track a particular X chromosome over more than just a couple of generations. Determining a common ancestor for an X chromosome is very difficult beyond a couple generations. Thus the X chromosome is not a very useful tool for Genealogy by DNA purposes. However the Y chromosome because of its small and very different size is not homologous with its X chromosome counterpart in a male offspring and is thus not subjected to cross-over effects and thus the Y chromosome is passed down from fathers to sons unchanged over many generations, except for occasionally occurring natural mutations. Compare to Y Chromosome. See Sex Chromosome and Autosome.

X Chromosome (Genome)

One of the two sex chromosomes, X and Y.
See also: Y chromosome, sex chromosome

X Chromosome (HIV and AIDs)

A sex chromosome found in certain animals where the male is the heterogametic sex. In the XY set of sex chromosomes, the female has two X chromosomes and the male has only one (and usually also a Y chromosome). In plants which use the XY system, this chromosome is female-determining.

X Chromosome (Huntingtons Disease)

One of the two sex chromosomes (the other is the Y chromosome). Males have one X and one Y. Females have two X’s.

X Chromosome (Medical)

One of the two sex chromosomes; determines female sex characteristics

X Chromosome (Science)

One of the sex chromosomes

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