Question

Four different steps that occur during meiosis are given in the following list :
(i) Complete separation of chromatids
(ii) Pairing of homologous chromosome
(iii) Linning up of paired chromosome on the equatorial plane
(iv) Crossing over between chromatids

• A. (i), (ii), (iii), (iv)
• B. (iii), (ii), (iv), (i)
• C. (iii), (ii), (i), (iv)
• D. (ii), (iv), (iii), (i)

Answer 1

The correct option is D (ii), (iv), (iii), (i)

Pairing of homologous chromosomes occurs in zygotene and crossing over occurs in pachytene stage of prophase of meiosis I. Paired chromosomes line up on equatorial plane in metaphase I. Then there is complete separation of chromatids in anaphase I of meiosis I.
So, the correct sequence is (ii), (iv), (iii), (i).
Therefore, option (d) is correct.