You aren't the same person you were an hour ago, at least not cell for cell. Here's how one cell becomes two.
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Students will describe mitosis as the division of a nucleus into two nuclei with the same number of chromosomes, name its stages in order, tell how plant and animal cells divide their cytoplasm differently, and give examples of asexual reproduction.
Most of a cell's life is interphase, where it grows and copies its chromosomes. Mitosis then runs prophase, metaphase, anaphase and telophase, and the cytoplasm divides last.
The two things the book asks the student to remember: mitosis divides the nucleus, and each new nucleus gets the same number of chromosomes as the old one. Human body cells have 46.
Make the book's Mini-Lab model with yarn for chromosomes and thread for spindle fibers, one poster per stage. Moving the yarn through the stages by hand is what makes the order stick.
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Before You Start
The words this lesson uses. Tap a card to see what it means, then come back to them whenever a question uses one.
Part One
Questions about the story you just read. Pick your answer straight off, or press Find it in the story if you would rather hunt for the sentence first.
Part Two
The word cards are at the top of this page. Look back at them as often as you need, then answer.