Question

Match List I with List II :

List - I		List – II
A.	Chiasmata formation	i.	Pachytene
B.	Crossing over	ii.	Diakinesis
C.	Synaptonemal complex formation	iii.	Diplotene
D.	Terminalisation of chiasmata	iv.	Zygotene

Choose the correct answer from the options given below :

• A. A-III, B-I, C-IV, D-II
• B. A-II, B-I, C-III, D-IV
• C. A-III, B-I, C-II, D-IV
• D. A-II, B-III, C-IV, D-I

Answer 1

The Correct Option is A

To match the phases of meiosis with the described events, let's carefully examine each phase and the corresponding events:

1. Chiasmata formation: This occurs during the Diplotene stage. During diplotene, the synaptonemal complex dissolves, and homologous chromosomes remain connected at structures called chiasmata. These chiasmata are the sites of previous crossing over, which is essential for genetic recombination. Thus, A matches with III.
2. Crossing over: This typically occurs during the Pachytene stage of prophase I. During this phase, homologous chromosomes exchange genetic material through a process called crossing over, which is crucial for genetic diversity. Thus, B matches with I.
3. Synaptonemal complex formation: This occurs during the Zygotene stage. In this phase, homologous chromosomes begin to pair and become connected by a structure known as the synaptonemal complex. Thus, C matches with IV.
4. Terminalisation of chiasmata: This occurs during Diakinesis. During diakinesis, the chiasmata move towards the ends of the chromosomes, which is known as terminalisation. Thus, D matches with II.

Therefore, the correct matchings are:

• A - III
• B - I
• C - IV
• D - II

The correct answer from the provided options is: A-III, B-I, C-IV, D-II.