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Multiple Choice
The picture depicts homologous chromosomes aligning at the cell's equator, with spindle fibers attached to each chromosome. Which phase of meiosis is shown?
A
Anaphase II
B
Metaphase I
C
Prophase I
D
Telophase I
Verified step by step guidance
1
Step 1: Begin by understanding the key features of each phase of meiosis. Metaphase I is characterized by homologous chromosomes aligning at the cell's equator, while spindle fibers attach to each chromosome. This is distinct from other phases.
Step 2: Compare the description in the problem to the phases of meiosis. In Metaphase I, homologous chromosomes (pairs of chromosomes) align at the equatorial plate, which matches the description provided in the problem.
Step 3: Eliminate other options based on their defining characteristics. For example, Prophase I involves chromosome condensation and crossing over, not alignment at the equator. Anaphase II involves sister chromatids separating, and Telophase I involves the completion of the first meiotic division.
Step 4: Focus on the alignment of homologous chromosomes at the equator, which is a hallmark of Metaphase I. This is a key distinguishing feature that separates it from other phases.
Step 5: Conclude that the phase depicted in the image is Metaphase I, as it matches the description of homologous chromosomes aligning at the equator with spindle fibers attached.