Multiple choice

Who discovered the XY chromosome sex-determination system?

  1. Chien Shiung Wu

  2. Barbara McClintock

  3. Nettie Stevens

  4. Mae C. Jemison

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Nettie Stevens was a geneticist who discovered that sex is determined by chromosomes, specifically the XY system in insects.