meiosis & some mitosis. review: what do we know about mitosis?
TRANSCRIPT
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Meiosis& Some Mitosis
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Review: What do we know about Mitosis?
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Mitosis:1. Makes more cells!2. Begin with one cell, end with two!
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Mitosis: Essential for growth and repair of plant,
animal and human tissue.
Mitosis will help me grow!
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Mitosis will heal my wounds.
The sooner mitosis
happens… the sooner I can get this thing off my head.
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Mitosis1. Interphase
2. Prophase
3. Metaphase
4. Anaphase
5. Telophase
6. Cytokinesis
1.
2.
3.
4.
5.
6.
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Enough about mitosis…
what’s meiosis?
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What is Meiosis?
Makes more sex (reproductive) cells Sperm (in men) Eggs (in women)
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Who cares? No meiosis, no fertilization. No fertilization, no offspring. No offspring, no future.
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Meiosis in males: Produces sperm cells in the testes This process is called spermatogenesis
•Sperm cells carry genes that code for the father’s traits.
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Meiosis in females: Produces egg cells in the ovaries This is called oogenesis
•Egg cells carry genes that code for the mother’s traits.
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Sperm and egg cells are: Haploid (1n) Reproductive Cells (x y) Also called Gametes
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Gametes? Human Gametes are sperm and egg cells.
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Refresher: What does haploid mean?
Daughter Cells have halfhalf the number of chromosomes than the parents (1n)
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Result of Meiosis:
4 HaploidDaughter Cells!
1 2 3 4
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+ =
Sperm Cell Egg Cell Zygote
What’s a zygote?
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Fertilization: Gametes combine to form a zygote. We were all once a zygote! The zygote will then divide through mitosis
and grow into a living being.
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+ =
23 chromosomes
(1n)
23 chromosomes
(1n)
46 chromosomes
(2n)
Fertilization:
Human
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+ =
28 chromosomes
(1n)
28 chromosomes
(1n)
54
chromosomes
(2n)
Other examples:
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+ =
30 chromosomes
(1n)
30 chromosomes
(1n)
60
chromosomes
(2n)
Other examples:
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+ =
52 chromosomes
(1n)
52 chromosomes
(1n)
104
chromosomes
(2n)
Other examples:
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Recap: How is Meiosis different than Mitosis?
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Mitosis Makes more cells.
Divide Once = 2 Diploid Cells (2n)
Four Phases: Prophase Metaphase Anaphase Telophase
Makes more sex cells. (Sperm & Egg)
Divide Twice= 4 Haploid Cells (1n)
Two Major Phases: Meiosis I Meiosis II
Meiosis
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Critical Thinking:
Please answer in complete sentences on a blank piece of paper.
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Answer the following questions:
1. Explain a time when you have never felt so much pain. How did mitosis help you get through it?
2. Why do you think meiosis is important to production agriculture & animal science?