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?  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 review Mitosis & Meiosis

Mitosis vs. Meiosis EventMitosisMeiosis 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 √ √ √ √ √ √

Mitosis vs. Meiosis EventMitosisMeiosis Beginning cells diploid (2n) Beginning cells haploid (n) Ending cells diploid (2n) Ending cells haploid (n) Produces egg and sperm Produces body cells √ √ √ √ √ √

Mitosis Animation