Question

The frequency of recombination between gene pairs on the same chromosome on the same chromosome as a measure of the distance between genes was explained by?
 A. T.M. Morgan
B. Gregor J. Mendel
C. Alfred Sturtevant
D. Sutton Boveri

Answer 1

Hint: The frequency of recombination between gene pairs on the same chromosome was explained by Alfred Sturtevant, he explained recombination frequency between gene pairs is a measure of the distance between the genes and this distance between the genes is inversely proportional to the recombination frequency.

Complete answer:
The frequency of recombination is a measure of genetic linkage and is used in the formation of hereditary linkage maps. In the recombination frequency is the frequency in which one chromosomal crossover will take place between two genes during the process of meiosis. A centimorgan (cM) is a unit that portrays a recombination frequency of 1%. In this manner we can gauge the hereditary distance between two loci, in view of their recombination frequency. This is a decent measure of the genuine distance.
Double crossovers would turn into no recombination. In this case we cannot tell if crossovers took place. If the loci we're analyzing are very close (less than 7 cM) a double crossover is very unlikely. When distances become higher, the likelihood of a double crossover increases. As the likelihood of a double crossover increases we systematically underestimate the genetic distance between two loci.
Morgan tested and found that when the two genes in a hybrid cross arranged on the same chromosome, the extent of parental quality blend was a lot higher than the non-parental sort. In view of this perception, he coined the term recombination.
Morgan was the first to speculate the frequency of recombination was identified with the distance between the genes on a chromosome and Sturtevant was the first to clarify that the extent of the hybrid during traverse could be utilized as a list of the separation between genes. In view of this, he likewise developed the hereditary guide or genetic map of natural fruit flies.

Hence, the correct answer is option (C).

Note: Alfred Henry Sturtevant (November 21, 1891 – April 5, 1970) was an American geneticist. Sturtevant built the primary hereditary guide of a chromosome in 1911. He worked on Drosophila melanogaster with Thomas Hunt Morgan. By viewing the improvement of flies in which the earliest cell division can produce two unique genomes. In 1967, Sturtevant got the National Medal of Science.