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  • (a) Why did T.H. Morgon select Drosophila melanogaster for his experiments ? (b) How did he disprove Mendelian dihybrid  phenotypic ratio of  

(a) Why did T.H. Morgon select Drosophila melanogaster for his experiments ?

(b) How did he disprove Mendelian dihybrid F_{2} phenotypic ratio of  9:3:3:1 ? Explain giving reasons

 

 

Answers (1)

a) Morgan worked with the tiny fruit flies, Drosophila melanogaster, which were found very suitable for his experiments because of the following reasons

  1.  They could be grown on simple synthetic medium in the laboratory.
  2.  They complete their life cycle in about two weeks, and a single mating could produce a large number of progeny flies.
  3.  There was a clear differentiation of the sexes – the male and female flies are easily distinguishable.
  4.  It has many types of hereditary variations that can be seen with low power microscopes.

b) Morgan observed that genes of the traits closely linked on the same chromosome show very less recombinant percentage, whereas genes of the traits loosely linked on the same chromosome showed the higher recombinant percentage.

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Safeer PP

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