Mitosis vs miosis (Edexcel GCSE Biology): Revision Notes
📚 Revision Notes
Mitosis vs miosis
| Mitosis | Meiosis | |
|---|---|---|
| Where is occurs? | Happens in SOMATIC CELLS (whole body apart from ovaries/testes) | Happens in SEX ORGANS (anther• plant, ovaries and testes) |
| Importance? | • Growth of an organism • Repairs tissues • Cloning in bacteria • Asexual reproduction of plants | • Genetic variation within species • Reproduction |
| Differences | 1 division Produces genetically identical daughter cells Produces diploid daughter cells | 2 divisions Produces genetically unique daughter cells Produces haploid daughter cells |
| Similarities | • Require DNA to replicate/ more copies • Increase in number of cells • Spindle fibres occur • Both divide by same mechanism/process: Chromosomes line up along equator & spindles pull them apart to poles of cell |
| Sexual (meiosis) | Asexual (mitosis) |
|---|---|
| How plants & animals reproduce | How plants/ bacteria reproduce |
| Involves gametes from 2 parents which fuse together (fertilise) to form a zygote which develops | Needs one parent |
| Cell fusion involved | No cell fusion involved |
| Variety in offspring | Offspring are clones |
| Genetic diversity offspring | Genetically identical offspring |