Topic: Chromosome theory, linkage and crossing over· Genetics and Evolution

Frequency of recombination between gene pairs on same chromosome as a measure of the distance between genes to map their position on chromosome, was used for the first time by

1. Henking

2. Thomas Hunt Morgan

3. Sutton and Boveri

4. Alfred Sturtevant

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Answer: 4. Alfred Sturtevant

Key idea: Alfred Sturtevant, a student of T. H. Morgan, used the frequency of recombination between gene pairs on the same chromosome as a measure of the distance between them, and so made the first genetic maps.

Morgan discovered linkage; Sutton and Boveri proposed the chromosomal theory; Henking identified the X body.

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Frequency of recombination between gene pairs on same chromosome as a measure of the distance between genes to map their position on chromosome, was used for the first time by

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