1. A special form of cell division
Meiosis
A special form of cell division

2. Review Cell- smallest, more basic unit of life
Chromosome- It carries all of the information used to help a cell grow and reproduce
DNA- genetic material that is found in all living things
Nucleus –brain of the cell
Mitosis- where one cell divides into two almost identical cells
Somatic cells: body cells

3. DNA genetic material that is found in all living things
DNA long list of instructions that give your body its own shape and function

4. Review

6. Chromosomes We have 46 chromosomes They have two copies of DNA
Half if these chromosomes come from an egg cell, half from a sperm cell
The first cell is divided into two separate cells (Mitosis)

7. Vocabulary word for meiosis

8. Vocabulary Words Sex cells: sperm cell and egg cells
Meiosis: A type of cell reproduction in which sex cells are produced
Sex cells: sperm cell and egg cells
Males produced sperm cells and a female produces egg cells
Gametes: sperm and egg cell

9. Vocabulary Words Diploid cell: When a cell has two sets of chromosomes
2n because they have 2 sets of chromosomes.
Haploid cell: when a cell has only have one set of chromosomes
abbreviated as just “n” because they have one set of chromosomes

10. Reproduction: 2 types
Asexual reproduction: one cell divides into two identical ones
Sexual reproduction: sperm cell fertilizes egg cell

11. Asexual Mitosis is one type of asexual reproduction
Mitosis is a form of asexual reproduction because offspring have DNA that is identical to their parents.
In asexual reproduction there is only one parent
Offspring
Parent
Cell

12. Sexual Reproduction
Sexual reproduction involves the combining of DNA from two separate cells to begin a new organism.
Sexual reproduction usually involves two different parents

13. Homologous chromosome: the similar but nonidentical chromosome pairs an organism receives from its two parents

14. Meiosis

15. Meiosis
The goal is to make daughter cells with exactly half as many chromosomes as the starting cells
Purpose: Reproduction
Process that produces haploids cells

16. What is meiosis? During Meiosis, two nucleus divisions occur Meiosis I
Meiosis II

17. Vocabulary builder

19. Interphase Before meiosis starts, each chromosome is duplicated
Just like in mitosis

20. Prophase I
The membrane surrounding the nucleus disappears, and twin chromosomes become visible

21. Mitosis and Meiosis
They are similar process because new cells are formed from cells that already exist

22. Why does it mean to reproduce?
Turn and talk to your partners

23. Cell divide twice during meiosis
Before meiosis begins, the chromosomes of the parent cells are copied

24. Metaphase I
Pair of twin chromosomes line up in the middle of the cell

25. Anaphase I Twin chromosomes move to opposite sides of the cell
The sister chromatid stay together, chromosome is being pulled apart

26. Telophase I
A membrane forms around each group of twin chromosomes

27. The membrane surrounding the nucleus disappears, and the twin chromosomes become visible

28. Twin chromosomes line up in the middle of the cell split, and then each single chromosome moves to opposite side of the cell

29. A membrane forms around each set of chromosomes

30. The cell divides in two.