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The chromosomes cannot be seen but they duplicate the DNA and double in mass
(Mitosis) |
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Chromosomes in the nucleus condense, pairs of centrioles move to opposite sides of the nucleus, spindle fibers form a bridge between the ends of the cell, and the nuclear envelope breaks down
(Mitosis) |
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chromosomes are pulled by spindle fibers into place. Chromosomes line up on cell's center line and are prepared for division
(Mitosis) |
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the chromosomes move from center line to their respective poles of the cell. Cell begins to stretch out as the opposite ends are pushed apart
(Mitosis) |
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Final stage in mitosis. Cell itself is ready to divide. One set of chromosomes is now at each pole of the cell. Spindle fibers disappear, and nuclear membrane forms around each set of chromosomes. Nucleolus appears within each new nucleus and single stranded chromosomes uncoil into invisible strands of chromatin
(Mitosis) |
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Cell physically splits. Cleavage furrow pinches off completely, closing the cell. Cell has reproduced successfully and cycle is repeated..
(Mitosis) |
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| When a cell divides itself in half to make two identical copies |
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| What is the difference between Meiosis and Mitosis? |
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Definition
| results in cells that only have half the usual number of chromosomes, one from each pair. |
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| What are the phases of Meiosis? |
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Definition
| Prophase, Metaphase, Anaphase, Telophase |
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Term
Chromosomes become visible, the nuclear envelope disappears and centrioles begin forming spindle fibers that envelope the chromosomes
(Meiosis I stage) |
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Definition
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Chromosomes line up along the equatorial of spindle fibers in homologous pairs
(Meiosis I phase) |
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Chromosomes are divided so that there are equal amounts on either side of the cell. Since there are 46 cells in a human cell, 23 end up on either side
(Meiosis I) |
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Definition
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Two daughter cells are completely divided, a nucleic envelope forms and the chromosomes become less visible. There are 23 chromosomes in each of these cells
(Meiosis I) |
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Definition
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chromosomes become visible, nuclear envelope disappears and the centrioles form spindle fibers
(meiosis II) |
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chromosomes line up along middle line on spindle fibers
(meiosis II) |
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Chromosomes get split into two chromatids (two strands of DNA) that make up chromosome. Joined by a mid-way connection called a centromere
(meiosis II) |
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The cells are completely divided. Nucleic envelope reforms and four new cells with different DNA created
(meiosis II) |
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| In males, all four cells become ___________. In females, only one becomes a mature ________, while the remaining three become reabsorbed into the body. |
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