Nettie Stevens
Nettie Maria Stevens was an American geneticist who discovered sex chromosomes. In 1905, soon after the rediscovery of Mendel's paper on genetics in 1900, she observed that male mealworms produced 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. The pair of sex chromosomes that she studied later became known as the X and Y chromosomes.
From *.wikipedia.org,
General Info
.
Female
Date of Birth
July 7th, 1861
Age
163
Birth Place
United States of America, Vermont
Date of Death
May 4th, 1912
Died Aged
50
Star Sign
Cancer
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