Question

During gamete formation, the enzyme recombinase plays active role during

• A. Prophase I
• B. Prophase II
• C. Metaphase I
• D. Anaphase II

Answer 1

Answer: (A)

Prophase I

Meiosis occurs in two stages Meiosis I and Meiosis II. Crossing over and reduction in chromosome number occurs during meiosis I. The meiosis I is completed in stages like prophase I, metaphase I, anaphase I and telophase I. The prophase I is a very elaborate and complex stage. It comprises of leptotene, zygotene, pachytene, diplotene and diakinesis. The crossing over occurs in pachytene stage between non-sister chromatids of same bivalent. The crossing over is a complex enzyme catalysed process. The recombinase enzyme complex carries out crossing over in the pachytene sub-stage of prophase I stage of meiosis I of meiotic cell division.

So, the correct answer is option A.