Question

Arrange these figures in ascending order of cell divisions.

• A. C, D, A, B
• B. B, A, D, C
• C. A, B, C, D
• D. B, D, A, C

Answer 1

Answer: (D)

B, D, A, C

The figures show various stages of meiotic first prophase. Prophase of first meiotic division comprises of following sub-stages- Leptotene, zygotene, pachytene, diplotene and diakinesis. Leptotene is the first substage which is characterised by the coiling of chromosomes. Zygotene is the second substage which is characterised by the pairing of homologous chromosome. Pachytene is the third substage, characterised by crossing-over event between non-sister chromatids of a homologous pair of chromosome. In diplotene stage, points at which crossing over had occurred are visible as X-shaped structures called as chiasma.

So, the correct answer is option D.