BioScience Dictionary

 
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Found X chromosomes 8 times.

Displaying results 1 to 10.

1. Autosomes
The chromosomes other than the sex chromosomes . Each member of an autosome pair (in diploid organisms) is of similar length and in the genes it carries.

2. Sex chromosomes
The chromosome s which determine the gender of the organism (for organisms whose gender is determined by gene s rather than by environment). In humans, fruit flies, and other animals where the male is the heterogametic sex , they are the X chromosome s and Y chromosome s. In birds, moths, and other animals where the female is the heterogametic sex, they are the W chromosome s and Z chromosome s. For humans, the sex chromosomes are the 23rd pair of all chromosomes. The sex chromosomes of most plants (when they exist) are also known as X and Y chromosomes; Ginkgo trees have a different system of sex chromosomes. Compare autosome .

3. Sex chromosomes
The chromosomes that determine the sex of an organism. In humans, females have two X chromosomes , and males have one X chromosome and one Y chromosome. Chromosome that determines the gender (sex) of the individual. Human males have a large X and a smaller Y sex chromosomes, while human females have two X sex chromosomes.

4. W chromosome
A sex chromosome found in all birds and certain other animals where the female is the heterogametic sex . The W chromosome causes the individual to become female in bird species. It is part of the WZ set of sex chromosomes, where the female has one W chromosome and one Z chromosome , and the male has two Z chromosomes.

5. X chromosome
A sex chromosome found in humans, fruit flies, and certain other 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.

6. X-chromosome
One of the sex chromosomes.

7. Y chromosome
A sex chromosome found in humans, fruit flies, and certain other animals where the male is the heterogametic sex . The Y chromosome causes the individual to become male in most mammal species and carries few other gene s besides those dictating sperm development and triggering appropriate hormonal output. It is part of the XY set of sex chromosomes, where the male has only one X chromosome and usually a Y chromosome (fruit fly males can also have just one X and nothing else), and the female has two X chromosomes.

8. Z chromosome
A sex chromosome found in all birds and certain other animals where the female is the heterogametic sex . It is part of the WZ set of sex chromosomes, which are so designated to prevent confusion with the XY set of sex chromosomes for species where the male is the heterogametic sex. In the WZ system, the male has two Z chromosomes and the female has only one (and one W chromosome ).