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Nettie Stevens

Cards_NoBorder_0070_NettyStevens.jpg
Cards_NoBorder_0070_NettyStevens.jpg

Nettie Stevens

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American geneticist. She discovered that male beetles produce two kinds of sperm, one with a large chromosome and one with a small chromosome. When the sperm with the large chromosome fertilized eggs, they produced female offspring, and when the sperm with the small chromosome fertilized eggs, they produced male offspring. This pattern was observed in other animals, including humans, and became known as the XY sex-determination system. Edmund Beecher Wilson independently made the same discovery. 

Beatriz Espinosa

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