Asexual, sexual reproduction and mitosis
- Created by: chelsey866
- Created on: 08-03-14 09:15
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- Mitosis, asexual and sexual reproduction
- Mitosis makes new cells for growth and repair
- 1) body cells normally have two coipes of each chromosome
- 2) they get one copy of each chromosome from the mother and one from the father
- 3) so humans have two copies of chromosome 1, two copies of chromosome 2
- 4) Diagram shows the 23 pairs of chromosomes from a human cell
- 5) When a body cell divides it needs to make new cells identical to the original cell- with the same number of chromosomes
- 6) This type of cell division is called mitosis
- 7) Mitosis happens in plants and animals. It happens when they want to grow or to replace cells that have been damaged
- Mitosis is when a cell copies itself by splitting to form two identical offspring
- 1) a cell with two sets of chromosomes
- 2) The DNA is copied and forms X-shaped chromosomes. Each arm of the chromosome is an exact cop of the other
- The cell divides once
- 4) you now have two new cells containing exactly the same DNA- they're identical
- Asexual reproduction uses mitosis
- 1) Some organisms reproduce by mitosis
- 2) this is an example of asexual reprodction
- 3) the offspring have exactly the same genes as the parent-so there's no variation
- 4) other organisms (like humans) reproduce sexually
- Meiosis makes new sex cells
- 1)Gametes are sex cells(sperm cells, egg cells)
- 2) cells in your reproductive organs(testies or ovaries) divide to form gametes
- 3) This type of cell division is called meiosis
- Gametes only have one set of chromosomes
- Sexual reproduction involves gametes
- 1) During sexual reproduction, gametes combine to form a new individual
- 2) 1st is fertilisation-the sperm + egg join to form a new body cell
- 3) this new cell grows by dividing by mitosis
- 4) The new individual will have a mixture of two sets of chromosomes. This means it will inherit features from both parents
- This means it will inherit features from both parents
- This is how sexual reproduction produces variation
- This means it will inherit features from both parents
- Mitosis makes new cells for growth and repair
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