What is the result of homologous chromosomes failing to separate during meiosis?
a. Neurofibromatosis
b. Nondisjunction
c. Polyploidy
d. Conjoined twins
ANS: B
Nondisjunction is an error in which homologous chromosomes or sister chromatids fail to sepa-rate normally during meiosis or mitosis. Neurofibromatosis is not due to chromosome failure dur-ing meiosis. Polyploidy occurs when a euploid cell has more than the diploid number of chromo-somes. Conjoined twins are not due to chromosome failure during meiosis.
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