1. Mitosis & Meiosis
What’s the difference?

2. Mitosis the process where one cell divides into 2 identical cells
This is how we grow and repair our bodies
What has to happen BEFORE mitosis can occur?

3. Answer: The DNA has to
replicate ( be copied!)
Human Cell = 46 chromosomes

4. Chromosomes

5. Karyotype

6. Parent cell
Chromosomes are copied and double in number (sister chromatids are attached at by the centromere
Chromosomes now split
2 daughter cells identical to original

7. Animation of mitosis:

8. Humans usually have 46 chromosomes
23 pairs of chromosomes
1 copy from MOM
1 copy from DAD
Called “diploid”

9. IT’S ALL ABOUT SEXUAL REPRODUCTION…
MEIOSIS
IT’S ALL ABOUT SEXUAL REPRODUCTION…

10. MEIOSIS Chromosome number is reduced by HALF, called “Haploid”
Each cell will have 23 chromosomes
Egg & Sperm Cells

12. Sexual Reproduction Fertilization: 23 Egg + 23 Sperm = 46 Zygote
Zygote is a fertilized egg, which will grow into a new person!

13. Animation of Meiosis