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NEETZoologyPrinciples of Inheritance and Variation

Match List-I with List-II. List-I List-II A. Morgan's Cross A (yellow body, white eye) I. Genetic mapping B. Morgan's Cross B (white eye, miniature wing) II. Chromosomal theory of inheritance C. Alfred Sturtevant III. 1.3% recombination D. Sutton and Boveri IV. 37.2% recombination Choose the correct answer from the options given below:

Options

  1. AA-IV, B-III, C-I, D-II
  2. BA-III, B-IV, C-I, D-II
  3. CA-III, B-IV, C-II, D-I
  4. DA-IV, B-III, C-II, D-I

Correct answer

B. A-III, B-IV, C-I, D-II

Step-by-step solution

Morgan carried out several dihybrid crosses in Drosophila to study genes that were sex-linked. In his Cross A (yellow body and white eye), he observed tight linkage with only 1.3% recombination. In Cross B (white eye and miniature wing), the genes were loosely linked, showing 37.2% recombination. Alfred Sturtevant, Morgan's student, used the frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes and mapped their position on the chromosome (Genetic mapping). S

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