At which stage of meiosis-I does crossing over occur?

Question

At which stage of meiosis-I does crossing over occur? (A) Leptotene (B) Zygotene (C) Pachytene (D) Diplotene

Tardigrade Admin · Accepted Answer

During pachytene stage of meiosis-I, a tetrad of the chromosomes form known as a bivalent. This is the stage when homologous recombination, including chromosomal crossover (crossing over) occurs.

Q. At which stage of meiosis-I does crossing over occur?

Leptotene

Zygotene

Pachytene

Diplotene

During pachytene stage of meiosis-I, a tetrad of the chromosomes form known as a bivalent. This is the stage when homologous recombination, including chromosomal crossover (crossing over) occurs.