What occurs when chromosomes do not separate during meiotic divisions?Multiple choice question.nondisjunctioncrossing overconjugationfertilization
Question
What occurs when chromosomes do not separate during meiotic divisions?
- nondisjunction
- crossing over
- conjugation
- fertilization
Solution
Answer
The correct choice is nondisjunction.
Nondisjunction occurs when chromosomes fail to separate properly during meiotic divisions. This can lead to gametes that have an abnormal number of chromosomes, which can result in genetic disorders or conditions such as Down syndrome, Turner syndrome, or Klinefelter syndrome when fertilization occurs.
In contrast, crossing over refers to the exchange of genetic material between homologous chromosomes during meiosis, conjugation is a type of genetic exchange in bacteria, and fertilization is the union of male and female gametes. Therefore, the phenomenon specifically related to the improper separation of chromosomes during meiosis is nondisjunction.
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