Lack of independent assortment of two genes A and B in the fruit fly Drosophila is due to:
Recombination
Linkage
Crossing over
Repulsion
T.H. Morgan carried out dihybrid crosses in Drosophila and observed that two genes situated on the same chromosome did not segregate independently of each other. He attributed this lack of independent assortment to the physical association of the two genes and coined the term Linkage to describe this physical association of genes on a chromosome .
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