Question

Crossing-over occurs between

• A. sister chromatids of the same chromosome
• B. two different kinds of bivalents
• C. two different kinds of chromosomes
• D. nonsister chromatids of a bivalent

Answer 1

The correct option is D nonsister chromatids of a bivalent

Crossing over is a process in which a pair of homologous chromosomes exchanges its DNA content. this crossing over takes place between the non sister chromatids of the homologous chromosome.

So the correct answer is 'nonsister chromatids of a bivalent'.