mitosis/meiosis how do your cells divide?. a few words before we start….. haploid:n one set of...
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Mitosis/Meiosis
How do your cells divide?
A few words before we start…..
• Haploid:n one set of chromosomes
• Diploid: 2n two sets of chromosomes
Mitosis
• Body Cells divide to create new body cells
Parent Cell
DNA condenses into chromosomes
Chromosomes align on the equator
Chromosomes separate
DNA uncoils
It’s all about the chromosomes!
– There are 46 in human body cells– Before mitosis 46 chromosomes– After mitosis 46 chromosomes
Which Cells Go Through Mitosis?
Growth
Repair
Work
Cells which help the body in:
Mitosis Review 1. Is the beginning parent
cell diploid or haploid (2n or n)?
2. Are the daughter cells diploid or haploid (2n or n)?
More Mitosis Review
3. How many daughter cells are produced?
4. Are the resulting daughter cells different from the parent cell?
More Mitosis Review
5. Are the resulting daughter cells different from each other?
6. How many chromosomes are in a human parent cell?
7. How many chromosomes are in a human daughter cell?
More Mitosis Review
8.What types of cells are produced by mitosis?
9. Why (when) does a cell go through mitosis?
Meiosis
Sexual Reproduction (two parents)
Why Meiosis?• Meiosis - Production of
gametes
• Gametes- sex cells sperm and egg
Meiosis Review
1. Is the beginning parent cell diploid or haploid (2n or n)?
2. Are the resulting daughter cells diploid or haploid (2n or n)?
More Meiosis Review
3. How many daughter cells are produced?
4.Are the resulting daughter cells different
from the parent cell?
More Meiosis Review
5. Are the resulting daughter cells different from each other?
7. How many chromosomes are in a human daughter cell?
6. How many chromosomes are in a human parent cell?
More Meiosis Review
8. What types of cells are produced by meiosis?
Fertilization- egg and sperm combine to create a zygote
Zygote- fertilized egg
46
Mom
23
Dad
23
This is how new organisms are made!!
Let’s reviewMitosis & Meiosis
Mitosis vs. Meiosis
Event Mitosis Meiosis
Produces 4 cells
Produces 2 cells
New cells identical
New cells different
New cells have the same number of chromosomes as parent
New cells have fewer chromosomes than parent
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Mitosis vs. Meiosis
Event Mitosis MeiosisBeginning cells diploid (2n)
Beginning cells haploid (n)
Ending cells diploid (2n)
Ending cells haploid (n)
Produces egg and sperm
Produces body cells
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Mitosis Animation