Principles of Inheritance and Variation Question 124

124. Crossing over that results in genetic recombination in higher organisms occurs between

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(a) sister chromatids of a bivalent

(b) non-sister chromatids of a bivalent

(c) two daughter nuclei

(d) two different bivalents

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Answer : b

Hints & Solution

(b) Crossing over occurs between non-sister chromatids of two homologous chromosomes. Homologous chromosomes form bivalent. Crossing over occurs between chromosomes in a nucleus.