Match the following column I with column II.

Column I Column II
A Carcinogen 1 Cancerous tumour
B Anaphase-I 2 Disjunction
C Mitosis 3 Synapse
D Zygotene 4 Plectonemic coiling

A - 1, B - 2, C - 4, D - 3

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A - 3, B - 1, C - 4, D - 2

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A - 2, B - 3, C - 1, D - 4

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A - 4, B - 1, C - 3, D - 2

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Solution

The correct option is A A - 1, B - 2, C - 4, D - 3
Carcinogen is a chemical that can cause cancer. This agent have the capacity to activate the proto-oncogene. This is the agent which results in the formation of a cancerous tumour.
During the anaphase I, there is an individual separation of the chromosomes. During anaphase II, there is a breaking of the chromosomes from the centromere.
This results in proper distribution of the chromosomes in the gametes. This separation of the chromosomes is known as disjunction.
When there is non-disjunction, there is a failure in the segregation of the chromosomes and this results in the gametes with either less or more number of chromosomes.
During the stage of zygotene in the prophase I, the two homologous chromosomes comes close to each other. They unite to form the structure called the synapse. They overlap the regions of each other and form the tetrad.
Thus, the correct answer is option A.

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	Column I		Column II
A	Carcinogen	1	Cancerous tumour
B	Anaphase-I	2	Disjunction
C	Mitosis	3	Synapse
D	Zygotene	4	Plectonemic coiling

Match the following column I with column II.Column IColumn IIACarcinogen1Cancerous tumourBAnaphase-I2DisjunctionCMitosis3SynapseDZygotene4Plectonemic coiling

Match the following column I with column II.

Column I Column II
A Carcinogen 1 Cancerous tumour
B Anaphase-I 2 Disjunction
C Mitosis 3 Synapse
D Zygotene 4 Plectonemic coiling