Genes work at the molecular level to produce characteristics. A plant or animal recieves half its genes from its mother and half from its father during fertilisation, so has similar characteristics but is not identical to its parents.
The nucleus of a cell has chromosomes, which carries genetic information. Different genes control the development of different characteristics of an organism.
Genetic variation/causes- Differences in characteristics caused by differences in genes inherited
Environmental variation/causes- Differences in characteristics caused by differences in conditions in which developed
- Riding bike -> scars
- Training -> strength
Combination of both causes- Most variations caused by both
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