Which phrase best describes chromosomal nondisjunction?
a. failure of homologous pairs or sister chromatids to separate during meiosis
b. failure of sister chromatids to pair during mitosis
c. improper pairing of nonhomologous chromosomes during meiosis
d. failure of homologous pairs to separate during meiosis
Ans: a. failure of homologous pairs or sister chromatids to separate during meiosis
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