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The contributions of T.H. Morgan in the field of genetics is as follows:
тАв He proposed and established that genes are positioned on the chromosomes
тАв He discovered the basis for variations as a result of sexual reproduction
тАв He discovered the concept of linkage and discriminated linked and unlinked genes
тАв He stated the chromosomal theory of linkage
тАв He carried out a study on sex-linked inheritance
тАв Morgan stated chiasma type hypothesis demonstrating that the chiasma causes crossing over
тАв He observed that the frequency of recombination between two linked genes is directly proportional┬а ┬а ┬а ┬а ┬а to the distance between them both
тАв Proposed the theory of inheritance
тАв He put forward the methodology for chromosome mapping
тАв He carried out a study on mutation