Which one of the following syndrome is the result of meiotic non dysjunction?
Correct answer: D. All of these
- A. Klinefelters syndrome
- B. Turners syndrome
- C. Downs syndrome
- D. All of these
Explanation
Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate during meiosis, producing gametes with abnormal chromosome numbers. It can produce an extra X chromosome in Klinefelter syndrome, a missing X chromosome in Turner syndrome, or an extra chromosome 21 in Down syndrome. Students may choose only Down syndrome because it is the most commonly cited example, but all three can result from meiotic nondisjunction.
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About Chromosomes
Chromosomes are DNA-protein structures that carry genes and become visible during cell division. Coverage includes chromatin, centromeres, sister chromatids, homologous chromosomes, chromosome number, and the distinction between diploid and haploid cells, with links to DNA replication, mitosis and meiosis.
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