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