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Question : Conditions of a karyotype 2n +- 1 and 2n +-2 are called

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Aneuploidy
Polyploidy
Allopolyploidy
MONOSOMY

Solution :Aneuploidy represent chromosomes NUMBER different than multiple of basic CHROMOSOME number. it is due to failure of segregation of chromatids during cell division which results in the gain or loss of a chromosome(s), called aneuploidy. Aneuploidy arises due to non-disjunction of homologous chromosome.
= Aneuploidy is of four TYPES: (i) Monosomy = 2n-1 (ii) Nullisomy = 2n - 2 (iii) Trisomy = 2n + 1 (iv) Tetrasomy = 2n +2


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