|1902: Sutton's work with chromosomes.
|In 1902, Walter Sutton published his paper "On the
Morphology of the Chromosome Group in Brachyotola
magna" in which he hypothesized that chromosomes carry the cell's units of inheritance, occur in
distinct, and different pairs within a cell's nucleus, and that the behavior of the
chromosomes during the division of sex cells was the
basis for Mendelian
Law of Heredity. Sutton's discovery was the result of
research on grasshopper cells. In 1903 Sutton published
"The Chromosomes in Heredity," which stated
that chromosomes contain genes, and that the behavior of the
chromosomes during meiosis is random. These ideas formed
the basis of the later developed Chromosomal
Theory of Heredity, and proved to be milestone discoveries
in the understanding of genetics.