The sex chromosome that exists in paired form in females.
One of the two chromosomes (the X and the Y) that determine the sex of the animal. Females have two X chromosomes while males have one X and one Y. See Sex Chromosomes.
A sex chromosome. Female mammals have two X chromosomes. Males have an X and a Y chromosome.
One of two types of sex determining chromosomes, the other being the Y chromosome. When two X chromosomes, one from each parents, are paired with each other in a fertilized egg cell, the resulting child will be female. If the fertilized egg cell contains both an X and a Y chromosome, the resulting child will be male. The X chromosomes become subject to cross-over effects during subsequent egg cell creation in the female offspring, and thus the homologous gene alleles and genetic marker alleles in both these X chromosomes can randomly swap positions in the next generations making it very difficult to track a particular X chromosome over more than a couple of generations. Determining a common ancestor for an X chromosome is very difficult beyond a couple of generations; therefore, the X chromosome is not a very useful tool for genetic genealogy purposes.
the sex chromosome that is present in both sexes: singly in males and doubly in females; "human females normally have two X chromosomes"
One of the two sex chromosomes, X and Y. X is the sex chromosome that is present in both sexes: singly in males and doubly in females.
sex chromosome that confers femaleness in humans, in the absence of the Y chromosome. A normal complement for females is a pair of X chromosomes (XX) (see also Y Chromosome).
The sex chromosome that is paired (XX) in female cells and single (XY) in male cells.
A sex chromosome. Two X chromosomes comprise a female.
The X chromosome contains female genes. A maternal X chromosome is always passed on by the egg, and the fertilising sperm may pass on another X chromosome, or a Y chromosome. to top of page
The female sex chromosome. In species that have sex chromosomes that differ to one another this chromosome usually occurs as a pair in each female cell (i.e. XX in humans), and unpaired in each male cell (i.e. XY in humans).
One of the two "sex chromosomes" carried by human beings. Women typically have two X chromosomes for the 23rd pair, whereas men typically have one X chromosome and one Y chromosome. Note that X chromosome DNA is not the same as mitochondrial DNA (mtDNA).
One of the two sex chromosomes; determines female sex characteristics.
A chromosome which is present in two copies in the genome of normal human females but in only one copy in normal males.
The female chromosome. Females have two X chromosomesin their genotype.
One of the sex chromosomes. Females have two X chromosomes; males have one X chromosome.
Larger of the two sex chromosomes associated with genetic determination of sex. Normally females have two X chromosomes and males only one.
a sex chromosome; normal females carry two X chromosomes.
The congenital, developmental, or genetic information in the cell that transmits the information necessary to make a female. All eggs contain one X chromosome, and half of all sperm carry an X chromosome. When two X chromosomes combine, the baby will be a girl. See also Y Chromosome.
The X chromosome is one of the two sex-determining chromosomes in many animal species, including mammals (the other is the Y chromosome). It is a part of the XY sex-determination system and X0 sex-determination system.