Question

Match the stages of meiosis in Column I to their characteristic features in Column II and select the correct option using the codes given below:

• A. a-->ii.,b-->iv.,c-->iii.,d-->i
• B. a-->iv.,b-->iii.,c-->ii.,d-->i
• C. a-->iii.,b-->iv.,c-->ii.,d-->i
• D. a-->i.,b-->iv.,c-->ii.,d-->iii

Answer 1

The correct option is C a-->iii.,b-->iv.,c-->ii.,d-->i


Prophase I is comprised of five stages: 1) leptotene, 2) zygotene, 3) pachytene, 4) diplotene and 5) diakinesis.
1) Leptotene: chromosomes begin to condense.
2) Zygotene: chromosomes become closely paired.
3) Pachytene: crossing over occurs.
4) Diplotene: homologous chromosomes begin to separate but remain attached by the chiasmata.
5) Diakinesis: chromosomes condense and separate until terminal chiasmata only connect the two chromosomes. The chiasmata can be formed anywhere along the chromosome but during diakinesis, the chiasmatic connections are translated to the chromosomes' ends.

Metaphase I follows Prophase I, and during this stage, bivalent chromosomes attach to the spindle and align at the metaphase plate or the equatorial plate.