Question

Match the following columns.

	Column - I		Column - II
A.	Initiation of spindle fibres formation	1.	Anaphase - I
B.	Synthesis of protein for replication	2.	Zygotene
C.	Action of endonuclease	3.	S - phase
D.	Movement of chromatids towards opposite poles	4.	Pachytene
		5.	Anaphase

• A. $A-2,B-3,C-4,D-5$
• B. $A-3,B-2,C-1,D-5$
• C. $A-1,B-3,C-5,D-4$
• D. $A-5,B-3,C-1,D-2$

Answer 1

Answer: (A)

$A-2,B-3,C-4,D-5$

A) Initiation of spindle fibres formation occurs in the zygotene phase of the prophase 1 of meiosis because the centrioles move to the opposite poles thus inducing spindle fibre formation.

B)Synthesis of proteins etc occurs in the S- phase because DNA molecules are replicated in this phase. proteins are mainly replicated in G1 phase.

C) Action of endonucleases occurs in the pachytene stage where the crossing over takes place and these endonucleases help in the separation of the chromosomes.

D) Movement of chromatids to the opposite poles during the Anaphase because in Anaphase 1 the chromosomes present are bivalent and move to the periphery but not the chromatids.

So, the correct option is 'A−2, B−3, C−4, D−5'.