- Animal: cow
- desired characteristic: milk yield
- the farmer would collect all the milk but take the cows that produce 150ml to be the breeding cows in the next generation
- the farmer then selects the cows with high yield to become the breeding cow in the next breeding population
- as we progressively select, we are able to change the desired characteristic to develop it - by selective breeding
- for this to work, milk yield must be genetic (under the control of genes)
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