The cell pictured below has a trisomy of the medium sized chromosome there are t

Question

The cell pictured below has a trisomy of the medium sized chromosome there are three of these chromosomes. Paternal chromosomes are black and maternal chromosomes are white. Which of the situations below could have lead to this condition in this cell? select all that apply. Nondisjunction in anaphase 1 of meiosis in father Nondisjunction in anaphase 2 of meiosis in father Nondisjunction in anaphase 1 of meiosis in mother Nondisjunction in anaphase 2 of meiosis in mother Failure to replicate the chromosome in father Failure to replicate the chromosome in mother

Explanation / Answer

Answer:

Nondisjunction in anaphase 1 of meiosis in father.

Nondisjunction in anaphase 2 of meiosis in father.

Explanation:

Nondisjunction in anaphase 1 & 2 of meiosis in father causes trisomy & monosomy.

But anaphase 1 causes 50% of gametes are trisomy and remaining 50% of gametes are monosomy.

Anaphase 2 causes 25% of gametes are trisomy and remaining 25% of gametes are monosomy and 50% of gametes are normal haploid.

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