- Decide which characteristics are important
- Choose parents that show these characteristics
- Select the best offspring from parents to breed the next generation
- Repeat the process continuously
Examples of selective breeding:
Producing disease-resistand wheat by crossbreeding wheat plan5ts with disease resistance and wheat plants with a high yield.
Increasing milk yield by selecting bulls from high yield herds and breeding them with cows that have the best milk production.
Selective breeding can also be used to modify other characteristics of cattle
Problems with selective breeding
Future generations of selectively bred organisms will all share very similar genes. This could make some diseases more dangerous as all the organisms would be affected. Also there's increased risk of genetic disease caused by recessive genes.
Some genes would be lost, making it more difficult to produce new varieties in the future. In scientific language this would be described as ‘inbreeding can lead to a reduction in the size of the gene pool’.