- Gametes have half the usual number of chromosomes (23). They are haploid (one copy of each chromosome)
- Gametes are sex cells (Ova = female, Sperm = male).
- The two gametes combine during reproduction to form a new cell. (46 chromosomes).
- Before the cell divides it duplicates it's DNA. (as with Mitosis)
- In the first of two divisions in meiosis the chromosome pairs line up in the centre of the cell.
- They're pulled apart so each new cell only has one copy of each chromosome.
- Each new cell is made up of chromosomes from both the mother and father.
- Each new cell has a mixture of chromosomes from the mother and the father.
- This provides variation in the offspring.
- Huge advantage of sexual reproduction over asexual.
- In the second division the chromosomes line up again in the centre of the cell.
- The arms of the chromosomes are pulled apart (like Mitosis).
- You get 4 gametes.
- They have a single set of chromosomes each (23).