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  4. Chromosome number 2n - 1 is an example of

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Q. Chromosome number $2n - 1$ is an example of

AMUAMU 2005

Solution:

$2n -1$ is an example of monosomy. It is an aneuploid, in which a chromosome is deficient of its homologous causing genetic imbalance resulting in weaker than normal form. It is formed by the union of deficient gamete $(n - 1)$ and normal gamete. A same chromosome monosomic in human beings is Turners syndrome $(44 + XO = 45)$.
Trisomy is an aneuploid or heteroploid, which has one chromosome represented in triplicate $(2n + 1)$. It is formed by the union of a normal gametes with a gamete having an extra chromosome $(n + 1)$, eg, Klinefelters syndrome, which results due to additional X-chromosome.
Euploidy is the condition, in which chromosome number is exact multiple of genome like monoploidy, diploidy, polyploidy.