Which of the following theories regarding crossing over is called Precocity theory

Options :
  1. Copy choice theory
  2. Strain theory
  3. Chiasma type theory
  4. Breakage and reunion theory

Answer and Explanation :-

Answer: Option 2


According to C.D. Darlington, two homologous pair of chromosomes are twisted around each other due to which a sort of strain develops on chromatids, as a result of which they are broken at the point of contact. Broken ends further rejoin but not necessarily with the same segment from which they were detached. When broken ends of different chromosomes get joined, an exchange in genetic material occurs.

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