Refer to the figure above and then answer the question that follows.
-Nondisjunction in meiosis gives rise to gametes with abnormal chromosome numbers. Which of the events is likely to produce a higher percentage of abnormal gametes?
A) failure of homologous chromosomes to separate at meiosis I
B) failure of homologous chromosomes to separate at meiosis II
C) failure of sister chromatids to separate at meiosis I
D) failure of sister chromatids to separate at meiosis II
E) failure of sister chromatids to separate at mitosis

Question

Refer to the figure above and then answer the question that follows.
-Nondisjunction in meiosis gives rise to gametes with abnormal chromosome numbers. Which of the events is likely to produce a higher percentage of abnormal gametes?
A) failure of homologous chromosomes to separate at meiosis I 
B) failure of homologous chromosomes to separate at meiosis II 
C) failure of sister chromatids to separate at meiosis I 
D) failure of sister chromatids to separate at meiosis II 
E) failure of sister chromatids to separate at mitosis

Quizplus · Accepted Answer

Failure of homologous chromosomes to separate at meiosis I results in all resulting gametes having an abnormal number of chromosomes, leading to a higher percentage of abnormal gametes compared to failures in meiosis II or mitosis, where only some of the resulting cells are affected.

Refer to the Figure Above and Then Answer the Question