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Nettie Stevens, American geneticist credited with discovering sex chromosomes (born 1861)
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Nettie Stevens
American geneticist (1861–1912)
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.…Source: Wikipedia (CC BY-SA)
Sex chromosome
Chromosome that differs from an ordinary autosome in form, size, and behavior
Sex chromosomes are chromosomes that carry the genes that determine the sex of an individual. The human sex chromosomes are a typical pair of mammal allosomes. They differ from autosomes in form, size, and behavior. Whereas autosomes occur in homologous pairs whose members have…Source: Wikipedia (CC BY-SA)
May 4
Day of the year
May 4 is the 124th day of the year in the Gregorian calendar; 241 days remain until the end of the year.Source: Wikipedia (CC BY-SA)