INHERITANCE AND SELECTION
- Created by: Pippa124
- Created on: 01-04-14 17:14
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- Inheritance and Selection
- Sperm cell:
- Egg cell:
- Steps of fertilization; all sperm are racing to the egg, one sperm will win and hit the egg first to begin fertilizing the egg, the sperm and egg fuse together to create a new cell. The egg is fertilized,it now divides, cells divide again and again, the cells are becoming an embryo.
- example of inherited variation - foot size and height
- example of environmental variation - religion and tattoos.
- Identical twins- the sperm goes into the egg as normal but when the fused DNA in the cell begin to divide, they divide into 2 separate groups, they become 2 embryos. they look similar because they have the same DNA.
- Non identical twins - in a monthly cycle the mother produces 2 eggs where she would normally only produce one. That means 2 different sperm need to fertilize each egg - 2 embryos!
- Artificial Selection - when someone ha deliberately chosen a partner for each animal. Maybe because they both have desirable traits.
- Natural Selection - when they meet themselves and partner.
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