Question

Select the correct option.

A.	Synapsis aligns homologous chromosomes	1.	Anaphase II
B.	Synthesis of RNA and protein	2.	Zygotene
C.	Action of enzyme recombinase	3.	G${}_2$ phase
D.	Centromeres do not separate but chromatids move towards opposite poles	4.	Anaphase I
		5.	Pachytene

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

Answer 1

Answer: (D)

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

A. Homologous chromosomes pair up by a process called synapsis and form a complex bivalent structure in the zygotene stage of prophase I of meiosis I.

B. Synthesis of RNA and protein occurs in G2 phase. This particular phase is spent in synthesising molecules other than DNA, which are required for cell division.

C. Enzyme recombinase is involved in crossing over which occurs during pachytene stage of prophase I of meiosis I. Crossing over is a phenomenon of exchange of segments between non sister chromatids of homologous chromosomes.

D. In anaphase I stage of meiosis I, chromosomes move to opposite poles as centromeres do not separate.

So, the correct answer is 'A-2, B-3, C-5, D-4'.