A) Sister chromatids
B) Nonsister chromatids
C) Genes
D) Alleles
Correct Answer: B
Solution :
Crossing over is the exchange of chromosomal segments between non-sister chromatids of homologous chromosomes. Crossing over takes place during pachytene stage of meiosis-I. Gene is the segment of DNA that carries a particular character. The alternative forms (dominant, recessive) of the gene are called alleles.
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