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Q.

Chromosomal mapping was first carried out by

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a

Sutton  

b

Morgan 

c

Correns

d

Sturtevant  

answer is B.

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Detailed Solution

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While working on Drosophila in Morgan’s laboratory, Sturtevant did work on recombination frequency based on results of intercrossing between dihybrids with the help of formula : Number of recombinants/ total number individuals formed multiplied by 100. 1% recombination is one map unit or one Morgan or Centimorgan. Based on this formula he mapped the genes on X chromosome of Drosophila.

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Chromosomal mapping was first carried out by