1. THE CREATION OF SPERM & EGGS (OVA) IN ANIMALS
MEIOSIS
THE CREATION OF SPERM & EGGS (OVA) IN ANIMALS

3. Humans have two sets of chromosomes so we note this as 2n
Gametes have only 1 set of chromosomes so we note this as n

4. OOGENESIS- Creation of an egg

5. Animation

7. Meiosis has two Stages of Division
Why?
Because it creates 4 cells and each can only have _____chromosomes.
Meiosis I
Prophase I, Metaphase I, Anaphase I, Telophase I
Meiosis II
Prophase II, Metaphase II, Anaphase II, Telophase II

8. MEIOSIS I http://bcs. whfreeman. com/thelifewire/content/chp09/0902002

9. MEIOSIS II

11. Prophase I Crossing over of homologous chromosomes animation

12. Prophase I Crossing over of homologous chromosomes animation
Sister chromatids

13. MITOSIS V. MEIOSIS http://www.biologyinmotion.com/cell_division/index.html

14. MITOSIS V. MEIOSIS CHART

15. Sexual v. Asexual Reproduction
Asexual –creation of genetically identical offspring mostly simple, one cell organisms
Only need one parent to produce offspring
Shorter Development time, more offspring produced
No genetic variety, pass on mutations easily
Sexual –creation of genetically diverse offspring due to:
1. Crossing over
2. Independent Assortment of chromosomes
3. Random fertilization of gametes
4. Greater chance of favorable variations passed on

16. Nondisjunction
Failure of homologous chromosomes to separately evenly during mitosis or meiosis

17. Types of chromosome mutations