An excess of one type of chromosome in a cell is an example of
A) allopolyploidy.
B) autopolyploidy.
C) nondisjunction.
D) crossing over.
E) aneuploidy.

Question

Quizplus · Accepted Answer

An excess or deficiency of one type of chromosome in a cell is known as aneuploidy, which occurs due to nondisjunction during cell division. Therefore, option E is the correct choice. Option A and B both refer to the presence of extra sets of chromosomes, rather than an excess of a single chromosome, and option D refers to the exchange of genetic material between homologous chromosomes during meiosis, which does not result in an excess of any particular chromosome.

An Excess of One Type of Chromosome in a Cell