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Question

How many statements are correct regarding non-disjunction of chromosomes?


A
3
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B
4
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C
2
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D
1
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Solution

The correct option is D 1

Only statement iii is correct.

Chrosomes get distributed in the Anaphase stage of cell division. Non-disjunction happens at the chromosomal level. Non–disjunction is the process in which paired chromosomes fail to move to opposite poles during the Anaphase I stage of Meiosis.

Non-disjunction of chromosomes leads to the non-separation of homologous chromosomes and thus one cell will be having an extra chromosome while another a chromosome less. Thus non-disjunction changes the ploidy of cells.

Usually chromosomes get distributed equally in organisms; non–disjunction happens rarely, in certain specific conditions like old age.


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