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Q.
Morgan coined the term recombination to depict _______
NTA AbhyasNTA Abhyas 2020
Solution:
T.H. Morgan carried out several dihybrid crosses in Drosphila melanogaster and studied genes that were sex-linked. Based on his studies, he coined the terms linkage and recombination. Linkage describes the physical association of two genes on a chromosome while recombination is the generation of non-parental gene combinations.
Morgan hybridised yellow-bodied, white-eyed females to brown-bodied, red-eyed males and intercrossed their F1 progeny. He observed that the two genes did not segregate independently of each other and the F2 ratio deviated very significantly from the 9:3:3:1 ratio (expected when the two genes are independent).
Morgan and his group also found that even when genes were grouped on the same chromosome, some genes were very tightly linked (showed very low recombination) while others were loosely linked (showed higher recombination).