Reproduction
- Created by: nuhaazhar
- Created on: 17-09-16 08:06
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- Reproduction
- Asexual reproduction
- Parent organisms divide by MITOSIS
- Mitosis produces NEW CELLS that are IDENTICAL to each other, and to the parent cell
- Steps of mitosis
- 1. Parent cell
- 2. Chrrmsms make identical copies of themselves
- 3. They line up along the centre
- 4. They move apart
- 5. Two daughter cells form with identical chrms to the parent cell
- 4. They move apart
- 3. They line up along the centre
- 2. Chrrmsms make identical copies of themselves
- 1. Parent cell
- Steps of mitosis
- Mitosis produces NEW CELLS that are IDENTICAL to each other, and to the parent cell
- Examples
- Potatoes
- Strawberries
- Bacteria
- Parent organisms divide by MITOSIS
- Sexual reproduction
- Egg (23) + Sperm (23) = Zygote (46)
- Zygote contains chrmsms from both parents
- All zygotes are DIPLOID
- Combination of genes
- Gametes are produced by the process of meiosis
- All gametes are HAPLOID
- Steps of meiosis
- 1. Parent cell
- 2. Chrmsms make identical copies of themselves
- 3. Similar chrmsms pair up
- 4. Sections of DNA get swapped
- 5. Pairs of chrmsms divide
- 6. Chrmsms divide
- 5. Pairs of chrmsms divide
- 4. Sections of DNA get swapped
- 3. Similar chrmsms pair up
- 2. Chrmsms make identical copies of themselves
- 1. Parent cell
- Zygote contains chrmsms from both parents
- Examples
- Humans
- Some animals
- Some plants
- Egg (23) + Sperm (23) = Zygote (46)
- In humans
- Gametes production
- Egg matures = an egg cell bursts out of the ovary and into the funnel at the end of the oviduct (OVULATION)
- Sperm production is v sensitive to heat. Too hot = cells with not develop
- Stages leading to implantation
- 1. Ovulation
- 2. Fertilisation. Fusion of nuclei of 2 gametes
- 3. The zygote divides by mitosis
- 4. A ball of cells is formed
- 5. Cells in the ball keep dividing. Now called an embryo.
- 6. Implantation. Embryo sinks into soft lining of uterus. Placenta starts to form.
- 5. Cells in the ball keep dividing. Now called an embryo.
- 4. A ball of cells is formed
- 3. The zygote divides by mitosis
- 2. Fertilisation. Fusion of nuclei of 2 gametes
- 1. Ovulation
- Birth
- Muscles of uterus = contract to push baby out
- Wall of the vagina = stretch to allow baby to be pushed through
- Wall of cervix = dilates and become softer; wide enough for baby
- The menstrual cycle
- A follicle containing an egg develops. Uterus lining is prepared.
- Ovulation. Fertilisation could take place.
- Follicle turns into corpus luteum.
- Menstruation. Not fertilised egg = thick uterus lining breaks down and is gradually lost through the vagina (period)
- Follicle turns into corpus luteum.
- Ovulation. Fertilisation could take place.
- A follicle containing an egg develops. Uterus lining is prepared.
- Gametes production
- Asexual reproduction
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