A) Pachytene
B) Zygotene
C) Diplotene
D) Diakinesis
Correct Answer: A
Solution :
Crossing over is an enzymatic process occurring during the pachytene stage of prophase-I. The enzyme involved in this process is called recombinase which acids in the recombination of genes between homologous chromosomes. During zygotene stage, homologous chromosomes pair up by process called synapsis and form a complex bivalent structure. Diplotene is marked by the dissolution of synaptonemal complex and chaisma formation. While diakinesis is marked by terminalisation of chaismata (i.e. chaismata shifts towards periphery of chromosome).
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