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Q. Match the following column I with column II.

Column I Column II

A Carcinogen I Tumour

B Anaphase-I II Disjunction

C Mitosis III Synapse

D Zygotene IV Plectonemic coiling

Cell Cycle and Cell Division

A

A - I; B - II; C - IV; D - III

100%

B

A - III; B - I; C - IV; D - II

0%

C

A - II; B - III; C - I; D - IV

0%

D

A - IV; B - I; C - III; D - II

0%

Solution:

Carcinogen causes tumour. Disjunction of chromosomes takes place in anaphase-I and II when chromosomes move to the opposite poles of the cell.
Plectonemic coiling refers to the inter - twining of a double helix DNA molecule in such a way that unwinding of DNA helix molecule is required for its correction. This occurs in mitosis in which sister chromatids are tightly coiled upon each other. In zygotene, homologs align for synapsis.