Phenotype
is the the physical appearance/expression of a trait/characteristic
Genotype + Environmental Factors = Phenotype
Genotype + Environmental Factors = Phenotype
Potatoes have a genotype for size. If they are all grown in identical environments, we would see that they will all turn out the same size. If some were grown where there is little water, and others where there is plentiful water, we would see that the potatoes with the least available water will be smaller than the potatoes grown where there's plenty of water, although their genotypes are the same. Water availability is an example of an environmental factor.
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The phenotype of an organism can be changed by two things
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Hydrangeas and pH
Red/pink hydrangea flowers and blue/purple hydrangea flowers have the same genotype for flower colour. Red/pink flowers occur when they are in alkaline soils (pH 8-14). Blue/purple flowers occur when they are in acidic soils (pH 1-6). To test that hydrangea flower colour is dependent on genotype and environment, you could get some blue flowers, all with the same genotype (from the same plant) and grow them in soils of different pHs. If they change colour respective to the pH, then colour is determined by environment. If they do not change colour and remain blue/purple, then their colour is determined by genotype.
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Siamese colouring in cats and rabbits
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