Everything about The Xy Sex-determination System totally explained
The
XY sex-determination system is the
sex-determination system found in
humans, most other
mammals, some insects (
Drosophila) and some plants (
Ginkgo). In this system, females have two of the same kind of
sex chromosome (XX), and are called the
homogametic sex. Males have two distinct sex chromosomes (XY), and are called the heterogametic sex.
The XY sex determination system was first described independently by
Nettie Stevens and
Edmund Beecher Wilson in
1905.
Mechanisms
Some species (including most mammals) have a
gene or genes on the
Y chromosome that determine maleness. In the case of humans, a single gene (
SRY) on the Y chromosome acts as a signal to set the developmental pathway towards maleness. Other mammals use several genes on the Y chromosome for that same purpose. Not all male-specific genes are located on the Y chromosome.
Other species (including most
Drosophila species) use the presence of two
X chromosomes to determine femaleness. One X chromosome gives putative maleness. The presence of Y chromosome genes are required for normal male development.
Humans, as well as some other organisms, can have a chromosomal arrangement that's contrary to their phenotypic sex, that is, XX males or XY females. See, for example,
XX male syndrome and
Androgen insensitivity syndrome.
Further Information
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