Frequency of recombination between gene pairs on same chromosome as a measure of the distance between genes to map their position on chromosome, was used for the first time by

The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes to map their position on chromosome was first proposed by Alfred Sturtevant in 1913.

(1) Henking was a German biologist who first discovered the presence of sex chromosomes in insects. In 1891, while studying the testes of the mealworm beetle Tenebrio molitor, Henking observed that some of the cells contained an unusual body that was not present in other cells. He named this body the ‘X-element’, as he could not determine its function at the time.

(2) Thomas Hunt Morgan (1866-1945) was an American geneticist who made significant contributions to the field of genetics. Morgan is best known for his pioneering work on the fruit fly Drosophila melanogaster, which he used to study the inheritance of traits and the mechanisms of genetic recombination.

(3) Walter Sutton (1877-1916) and Theodor Boveri (1862-1915) were two pioneering geneticists who independently proposed the chromosome theory of inheritance.