Ohio Assessment for Educators (OAE) Integrated Science (024) Practice Exam

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What occurs during Metaphase II of meiosis?

Chromosomes condense
Homologous chromosomes pair up
Sister chromatids align at the equator
Cytokinesis begins

The correct answer is: Sister chromatids align at the equator

During Metaphase II of meiosis, sister chromatids align at the cell's equatorial plane, also known as the metaphase plate. This alignment is crucial for the subsequent separation of the sister chromatids, which will be pulled apart to opposite poles of the cell during Anaphase II. The process ensures that each daughter cell receives an identical set of chromosomes, maintaining genetic information across generations. In the context of meiosis, this phase follows Meiosis I, where homologous chromosomes have already been separated. Thus, by Metaphase II, the cells contain haploid sets of chromosomes, each consisting of two sister chromatids. Proper alignment during this stage is essential for the accuracy of the meiotic process, preventing issues such as nondisjunction, which can lead to aneuploidy in resulting gametes.