Discovery sex chromosomes

Hermann Henking

discovered the X chromosome in 1891 while studying sperm cells in firebugs, noting it as a mysterious structure he called the "X element.”

Clarence E. McClung

discovered that the X chromosome is a sex-determining chromosome in 1901, providing evidence that chromosomes are linked to the determination of sex.

Nettie Stevens

Discovered the Y chromosome in 1905, concluding that males have XY chromosomes and females have XX chromosomes.

Edmund Wilson

Independently supported the discovery of sex determination by chromosomes in 1905, confirming the role of the X and Y chromosomes

Calvin Bridges

Discovered in 1916 that chromosomal nondisjunction in fruit flies (Drosophila) provided evidence supporting the chromosome theory of inheritance, proving that chromosomes carry genetic information.

Murray Barr

Noted for his discovery of Barr bodies in 1949, providing insights into X chromosome inactivation in female mammals.

Thomas H. Morgan

A pioneering geneticist who demonstrated the role of chromosomes in heredity and provided evidence for the linkage of genes to specific chromosomes, famously studied the genetics of fruit flies.