CMID Practice Test

Euploidy is defined as which?

Too few chromosomes Too many chromosomes A complete set of chromosomes Multiple mutated chromosomes

Correct Answer:

A complete set of chromosomes

Explanation:

Euploidy means having a complete set of chromosomes, meaning the chromosome count is an exact multiple of the haploid number. In humans, that would be 46 in a typical diploid cell or, more generally, 2n, 3n, 4n, and so on—whole multiples of the normal chromosome set. This contrasts with states where chromosomes are missing or extra (not a whole multiple of the haploid set), known as aneuploidy. Mutated chromosomes refer to structural changes rather than the overall count, so they aren’t what euploidy describes.

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