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Step-by-Step Explanation
Step 1: Understanding the Stages of Mitosis
During mitosis, chromosomes go through several stages: prophase, metaphase, anaphase, and telophase. The visibility of chromosomes changes in each of these stages.
Step 2: Chromosome Visibility
• Prophase: Chromosomes begin to condense but are still partly intertwined, making them appear thin and filamentous.
• Metaphase: Chromosomes are highly condensed and align in the center of the cell (the metaphase plate), making them clearly visible and distinct.
• Anaphase: Sister chromatids separate and move to opposite poles; although they are visible, they are splitting and moving, which can complicate counting.
• Telophase: Chromosomes begin to uncoil, making them less distinct.
Step 3: Reason for Counting Chromosomes at Metaphase
At metaphase, each chromosome is fully condensed and lined up at the center of the cell. This alignment provides the clearest view of individual chromosomes. Their centromeres are also easily observable, making it the most convenient stage for counting and studying chromosome morphology.
