A) non-sister chromatids of the homologous chromosomes
B) sister chromatids of the homologous chromosome
C) chromatids of non-homologous chromo¬somes
D) the genes those are completely linked
Correct Answer: A
Solution :
Crossing over is a process that produces new combination of genes by interchanging of segments between non-sister chromatids of homologous chromosomes. It occurs between homologous chromosomes at four standard stage during pachytene of prophase-I of meiosis-I.
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