Mitosis and meiosis. Solving problems on the chromosome set of cells.
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The life cycle of a cell – interphase and mitosis, And how does it proceed? – This is the main question. It is impossible to say about it in a few words, Let us consider the process of cell life in verse. Interphase lasts longer than the division itself, DNA doubling occurs very quickly. Biosynthesis is underway, enzymes are active. The cell grows, forms organelles and elements Then follows mitotic division, Its phases are easy to remember – and there is no doubt about it. Look at them carefully. Each phase is like a member of a large and friendly family. The head of the family is dad (it is clear to everyone at once), And the first phase of mitosis is prophase. The nucleolus and nuclear membrane have disappeared, But it is too early to put an end to this. The chromosomes shorten, thicken, Turn into compact forms. And then without delay – The threads of the spindle of division appear. Mom is our sun, warmth, kindness. Metaphase is the second phase of mitosis always. Children are equal for a mother without a dispenser, Chromosomes lie in the equator area Daughter - Anya is just a princess in the family. Anaphase is the third phase of the process. You can see for yourself - The spindle threads pull the chromatids to different poles. The son in the family is Tolya - well, as if on order The fourth phase of mitosis is telophase. Chromosomes unwind, They have one way out - To turn into chromatin again. After the division of the cytoplasm and organelles of the cell, Two lovely, wonderful children appear. They have a diploid set Of daughter cells and are exactly like the mother cell.
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