Select the definition of aneuploidy.

a. the number of chromosome sets that make up a complete genome. b. a complete chromosome set or an exact multiple of the haploid chromosome set

c. a chromosomal complement with at least three complete sets of homologous chromosomes

d. the addition or loss of less than a full set of chromosomes or chromosome pairs

d. The addition or loss of less than a full set of chromosomes or chromosome pairs is the correct answer.

Explanation:

Aneuploidy is an abnormal condition because the number of chromosomes is not normal. This condition occurs due to the presence of extra chromosomes or loss of chromosomes that unbalance the chromosome number. Aneuploidy can cause miscarriage, birth problems, alter the fetus development. Different disorders arise from the aneuploidy condition such as turner's syndrome, Klinefelter syndrome, trisomy, Edwards syndrome, Patau syndrome.