The first phase of mitosis is what?

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Prepare for the Virginia 7th Grade Science SOL Test. Incorporate flashcards and multiple choice questions, each with hints and detailed explanations. Ensure your success on the exam!

Multiple Choice

The first phase of mitosis is what?

Explanation:
Prophase is the first phase of mitosis. In this stage, the long DNA strands condense into visible chromosomes, making them easier to separate later. The nucleolus disappears as the cell begins packing DNA, and the spindle apparatus starts to form outside the nucleus. The nuclear envelope breaks down so the chromosomes can move around the cell, and the replicated chromosomes, still as sister chromatids held together at the centromere, become organized and prepared for the next step. This setup is what starts the orderly process of dividing genetic material, leading into metaphase when the chromosomes move to the center.

Prophase is the first phase of mitosis. In this stage, the long DNA strands condense into visible chromosomes, making them easier to separate later. The nucleolus disappears as the cell begins packing DNA, and the spindle apparatus starts to form outside the nucleus. The nuclear envelope breaks down so the chromosomes can move around the cell, and the replicated chromosomes, still as sister chromatids held together at the centromere, become organized and prepared for the next step. This setup is what starts the orderly process of dividing genetic material, leading into metaphase when the chromosomes move to the center.

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