XY Sex-Determination System - Copy
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The XY sex determination system was first described independently by Nettie Stevens and Edmund Beecher Wilson in 1905
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The XY sex determination system was first described independently by Nettie Stevens and Edmund Beecher Wilson in 1905
![Page 2: XY Sex-Determination System - Copy](https://reader035.fdocuments.net/reader035/viewer/2022072009/55cf920d550346f57b930d70/html5/thumbnails/2.jpg)
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.