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• Explain what selective breeding is
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Selective breeding (also called artificial selection) is the human-directed process of choosing parents with desirable traits and mating them so those traits become more common in future generations.
Key points
- Basic idea: pick individuals that show traits you want (higher milk yield, bigger fruit, tame behavior, disease resistance, etc.), breed them, and continue selecting the best offspring over many generations.
- Biological requirement: the traits must be heritable (controlled by genes) and there must be genetic variation in the population for selection to act on.
- Common examples: the wide variety of dog breeds from wolves, improved crop varieties (e.g., higher-yield or disease-resistant wheat, hybrid corn), and livestock bred for meat, milk or egg production.
Methods and modern tools
- Traditional methods: mass selection, pedigree selection, inbreeding to fix traits, outcrossing to introduce new variation, and hybridization.
- Modern techniques: marker-assisted selection and genomic selection use DNA markers or whole-genome data to speed up and increase the accuracy of selecting desirable parents.
Benefits and limits
- Benefits: faster improvement of useful traits, greater productivity, better resistance to pests/diseases, and predictable characteristics.
- Limits/risks: reduced genetic diversity, inbreeding depression, accidental selection of undesirable linked traits (pleiotropy), vulnerability to new diseases or changing environments, and welfare concerns when extremes are bred (e.g., some dog breeds).
In short: selective breeding is a practical way humans shape the genetics of plants and animals by repeatedly choosing which individuals reproduce, but it requires care to avoid long-term genetic and welfare problems.
Key points
- Basic idea: pick individuals that show traits you want (higher milk yield, bigger fruit, tame behavior, disease resistance, etc.), breed them, and continue selecting the best offspring over many generations.
- Biological requirement: the traits must be heritable (controlled by genes) and there must be genetic variation in the population for selection to act on.
- Common examples: the wide variety of dog breeds from wolves, improved crop varieties (e.g., higher-yield or disease-resistant wheat, hybrid corn), and livestock bred for meat, milk or egg production.
Methods and modern tools
- Traditional methods: mass selection, pedigree selection, inbreeding to fix traits, outcrossing to introduce new variation, and hybridization.
- Modern techniques: marker-assisted selection and genomic selection use DNA markers or whole-genome data to speed up and increase the accuracy of selecting desirable parents.
Benefits and limits
- Benefits: faster improvement of useful traits, greater productivity, better resistance to pests/diseases, and predictable characteristics.
- Limits/risks: reduced genetic diversity, inbreeding depression, accidental selection of undesirable linked traits (pleiotropy), vulnerability to new diseases or changing environments, and welfare concerns when extremes are bred (e.g., some dog breeds).
In short: selective breeding is a practical way humans shape the genetics of plants and animals by repeatedly choosing which individuals reproduce, but it requires care to avoid long-term genetic and welfare problems.
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