mitosis/meiosis how do your cells divide?. a few words before we start….. haploid:n one set of...

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

Why Do Cells Divide?

Surface area

Damaged cells

Sex cells

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