During which phase do chromosomes line up at the equator in meiosis?

During meiosis, chromosomes align at the equatorial plane during the metaphase stages, specifically in both metaphase I and metaphase II. The particular focus of this question requires understanding that during metaphase I, homologous chromosomes (each consisting of two sister chromatids) line up at the equator of the cell, preparing for separation. In metaphase II, the individual chromosomes (still consisting of sister chromatids) line up at the equator.

The correct timing for chromosomes to line up at the equator during meiosis is in metaphase I, where the homologous pairs are arranged in preparation for the first division. In metaphase II, although chromosomes do line up again at the equator, it's important to recognize that they are no longer in pairs as they were in metaphase I; they are individual chromosomes.

Focusing on the context of the question, understanding how meiosis involves two rounds of division and where these alignments occur is key. Therefore, the specific phase of meiosis where chromosomes line up at the equator is during metaphase I for homologous pairs and also during metaphase II for individual chromosomes, making the first choice the most relevant.