the fertiliation of an abnormal anueploid maternal gamete with a normal paternal

Question

the fertiliation of an abnormal anueploid maternal gamete with a normal paternal haploid gamete resulted in trisomy of 13 chromosomes in a newborn (47,+`13). If three copies of chromosome 13 are all genetically different, at what point during oogenesis did the nondisjuction evert occur?

a. mitotic division in an oogonia ciall b. meiosis 1 in a primary oocyte 2. meiosis 2 in a secondary oocyte d. lack of cytokinesis after meisosi 1 e. lack of cytokinesis after meisosis 2.

im confuse with this question?

Explanation / Answer

2 option is right : meiosis 2 in a secondary oocytes

Because trisomy occured due to the nondisjunction of chromatids which is going to be separated during anaphase of meiosis 2 thus one of daughter cell has n+1 and another is n-1 gametes.

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