Multiple Choice
Which two products are the result of a primary oocyte completing the first meiotic division?
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27. The Reproductive System
Meiosis
Multiple Choice
These cells are the result of nondisjunction during which of the following phases of meiosis?
A
Anaphase I
B
Metaphase II
C
Prophase I
D
Telophase II
Verified step by step guidance1
Understand the concept of nondisjunction: Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate properly during cell division, leading to cells with an abnormal number of chromosomes.
Review the phases of meiosis: Meiosis consists of two stages, Meiosis I and Meiosis II, each with its own phases: Prophase, Metaphase, Anaphase, and Telophase.
Identify the phase where nondisjunction can occur: Nondisjunction can occur during Anaphase I when homologous chromosomes fail to separate, or during Anaphase II when sister chromatids fail to separate.
Analyze the options: Anaphase I is the phase where homologous chromosomes are supposed to separate. If nondisjunction occurs here, it results in gametes with an abnormal number of chromosomes.
Conclude based on the analysis: Since the problem specifies nondisjunction, and Anaphase I is a critical phase for the separation of homologous chromosomes, it is the phase where nondisjunction is most likely to occur, leading to the described result.
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