Question

From this information, can we know in which parent the nondisjunction began?

Answer 1

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.