From this information, can we know in which parent the nondisjunction began?
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Answer:
Nondisjunction occurs generally during female gamete formation.
Explanation:
Nondisjunction means nonseparation: of either homologous chromosome in meiosis I or of sister chromatids in meiosis II.
In both the cases abnormal gametes will be formed and after fertilisation, there will be trisomy or monosomy of chromosome.
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