Which of the following condition is called as monosomic?

2n+1

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2n+2

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n+1

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2n-1

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Solution

The correct option is A 2n-1
Presence of one extra chromosome than the normal chromosome number in a diploid species is known as trisomy (2n+1). Presence of one chromosome in four copies is known as tetrasomy (2n+2). Presence of one extra chromosome than the normal chromosome number in a haploid species is known as disomy (n+1). Monosomy is a aneuploid condition where one homologous chromosome is missing (2n-1).

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