Sex linked characteristic

A gene present on one of the sex chromosomes X or Y in mammals is a sex-linked trait because its expression depends on the sex of the individual. In humans, as well as in many other animals and some plants, the sex of the individual is determined by sex chromosomes. However, there are other sex determination systems in nature. For example, temperature-dependent sex determination is relatively common, and there are many other types of environmental sex determination. Some species, such as some snails, practice sex change adults start out male, then become female.
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12.2E: Sex-Linked Traits

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Sex-Linked Traits – Principles of Biology

Eye color in Drosophila , the common fruit fly, was the first X-linked trait to be identified. Thomas Hunt Morgan mapped this trait to the X chromosome in In flies the wild-type eye color is red X W and is dominant to white eye color X w Figure Because of the location of the eye-color gene, reciprocal crosses do not produce the same offspring ratios. Males are said to be hemizygous , in that they have only one allele for any X-linked characteristic. Hemizygosity makes descriptions of dominance and recessiveness irrelevant for XY males. Figure In Drosophila, the gene for eye color is located on the X chromosome.
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Sex linkage

Each individual has a pair of sex chromosomes ; one member of the pair is inherited from each parent. In humans, for example, the X , or female-determining, chromosome carries many genes, whereas the Y , or male-determining, chromosome is deficient in genes. A woman has two X chromosomes; a man has one X chromosome and one Y chromosome. Several traits, including red-green colour blindness , arise from the interaction of genes that are located on the X chromosome.
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Sex Linked Genes. A particularly important category of genetic linkage has to do with the X and Y sex chromosomes. These not only carry the genes that determine male and female traits but also those for some other characteristics as well.
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