A) trisomy
B) euploidy
C) polyploidy
D) monosomy
Correct Answer: D
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.
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