Discussion
A change in chromosome number, whether by adding or subtracting a whole part or whole set of a haploid complement, is termed:
Answer: C
The key's answer is Polyploidy.
A change in the number of chromosomes is a numerical aberration. Adding or losing a whole set of chromosomes is euploidy, of which polyploidy (three or more sets) is the main form, while adding or losing single chromosomes is aneuploidy. Of the options offered, polyploidy is the only change in chromosome number.
Translocation, inversion and duplication are structural aberrations: they rearrange, reverse or repeat segments of chromosomes without changing their number.
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