Which of the following conditions is called monosomic?

2n + 2

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2n − 1

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2n + 1

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n + 1

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Solution

The correct option is B
2n − 1

The presence of a single copy of a chromosome indicates monosomy (2n − 1). The presence of three copies of a particular chromosome indicates trisomy (2n + 1). An aneuploid having four copies of one chromosome is known as tetrasomic (2n + 2).

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With usual notations, $C_{1} + 2^{2} C_{2} + 3^{2} C_{3} + . . . . . . . =$

\tan^{- 1} \frac{1}{3} + \tan^{- 1} \frac{2}{9} + \tan^{- 1} \frac{4}{33} + . . . + \tan^{- 1} \frac{2^{n - 1}}{1 + 2^{2 n - 1}}

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