A child is born with an extra chromosome in each of it cells, the reason is___________________?
Correct answer: A. Non-disjunction
- A. Non-disjunction
- B. Segregation
- C. Hybridization
- D. Crossing over
Explanation
Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate properly, producing a gamete with an extra chromosome. After fertilisation, this can result in aneuploidy such as trisomy.
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