[stee-vuh
nz] 
| 1. | Alfred, 1817–75, English painter and sculptor. |
| 2. | George (Cooper), 1905–75, U.S. film director. |
| 3. | John Cox [koks] , 1749–1838, and his son Robert Livingston, 1787–1856, U.S. engineers and inventors. |
| 4. | John Paul, born 1920, U.S. jurist: associate justice of the U.S. Supreme Court since 1975. |
| 5. | Net⋅tie Marie [net-ee] , 1861–1912, U.S. cytogeneticist. |
| 6. | Thaddeus, 1792–1868, U.S. abolitionist and political leader. |
| 7. | Wallace, 1879–1955, U.S. poet. |
| Stevens, Nettie Marie 1861-1912. American cytogeneticist whose studies on the chromosomes of the common mealworm led to the discovery of the chromosomal determination of sex. |
| Stevens (stē'vənz) Pronunciation Key
American biologist who identified the role of X and Y chromosomes in determining the sex of an organism. Stevens studied the chromosomes of mealworm beetles, first establishing that chromosomes are inherited in pairs. She later showed that eggs fertilized by X-carrying sperm produced female offspring, while Y-carrying sperm produced male offspring. She extended this work to studies of sex determination in various plants and insects. |