Crossing over that results in genetic recombination in higher organisms occurs between:

• A

  sister chromatids of a bivalent
• Correct answer
  B

  non-sister chromatids of a bivalent
• C

  two daughter nuclei
• D

  two different bivalents.

Solution

Crossing over is the exchange of chromosomal segments between non-sister chromatids of homologous chromosomes during the production of gametes. It occurs during pachytene stage. (Ref. to Fig. 28.4)

Hence, the correct answer is option: 'B'.