T.H. morgan obtained phenytypic ration different from 9:3:3:1 during study on Drosophila. Explain its conclusion.

During the studies on genes in Drosopila that were sex-linked T.H. Morgan found F2-populabon phenotypic ratios deviated from expected 9 : 3 : 3 : 1. Explain the conclusion he arrived at.

Compare in any three ways the chromosomal theory of inheritance as proposed by Sutton and Boveri with that of experimental results on pea plant presented by Mendel. OR (a) Explain linkage and recombination as put forth by T.H. Morgan based on his observations with Drosophila melanogaster crossing experiment. (b) Write the basis on which Alfred Sturtevant explained gene mapping.

A trihybrid ratio of 27:9:9:9:3:3:3:1 is obtained because of

In a dihybrid cross carried by T.H. Morgan in Drosophila the F_(2) ratio deviated from that of Mendel's dihybrid F_(2) ratio. Give a reason.

Morgan carried out several dihybrid crosses in Drosophila and found F_(2) -rations deviated very significantly from the expected Mendelian ratio. Explain his findings with the help of and example.