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Definition of Nondisjunction

Given below a...

Question

Given below are three statements (i - iii) each with one or two blanks. Select the option which correctly fills up the blanks in the below statements.
i. The condition in which multiples of the basic set is present in a cell is called _A.

ii. Aneuploidy caused due to removal of chromosomes is called asB or addition of chromosomes is called as C_.

iii. If two additional chromosomes are present in a cell, then the type of hyperploidy is_D__.

A

A: Euploidy; B: Hyperploidy; C: Hypoploidy; D: Tetrasomy

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B

A: Hypoploidy; B: Aneuploidy; C: Hyperploidy; D: Tetrasomy

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C

A: Euploidy; B: Hyperploidy; C: Tetrasomy; D: Aneuploidy

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D

A: Euploidy; B: Hypoploidy; C: Hyperploidy; D: Tetrasomy

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Solution

The correct option is D A: Euploidy; B: Hypoploidy; C: Hyperploidy; D: Tetrasomy
Euploidy is the condition in which entire set of chromosomes is duplicated over several times.

Aneuploidy is the condition in which abnormal number of chromosomes are seen in the haploid set. This abnormal number can happen either due to loss of chromosomes or gain of it. When aneuploidy occurs due to loss of chromosomes it is called as hypoploidy whereas when addition takes place it is called as hyperploidy.
Tetrasomy is a type of aneuploidy (Hyperploidy) where there is a gain of extra two chromosomes of same type.

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Definition of Nondisjunction

Standard XII Biology

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