Answer to Question #174838 in Genetics for zoology

Question

explain the first gene map of chromosome of drosophila by alfred strurtevants?

Answer 1

Alfred Sturtevant used the frequency of crossing over to find out the distance between the genes. The frequency of crossing over is high if the genes are present at a distance. If genes are close to each other then there will be less likelihood of crossing over.

He first arranged 6, x linked genes of Drosophila. These genes were as follows:

B- black body-color

C- eye color

P- if present results in vermilion eyes if absent results in ordinary red

O(2 copies)- recessive gene codes for eosin colored eyes

As he observed no recombination between the C and O genes, he placed these genes in the same position. Then he observed cross-over frequency to find out the distance between the other genes.