Bio T4 Selective breeding
- Created by: Claudiacumberpatch
- Created on: 07-03-20 13:58
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- Selective breeding
- Humans artificially select plants/animals that will breed so genes for a particular characteristic remain in a poulation
- Key words
- Breed-groups within a species that are all different (e.g A Poodle & Labrador same species different breed)
- Species - animals that can reproduce together to produce FERTILE offspring
- Key words
- 1.) Select desired characteristic
- 2.) Breed organisms/parents that have these characteristics
- 3.) Select offspring that best show these characteristics to breed again to produce next generation
- 4.) Repeat process over many generations so desirable trait becomes stronger until all offspring have desired characteristic
- 3.) Select offspring that best show these characteristics to breed again to produce next generation
- Characteristics useful or attractive
- Animals make more meat/ milk
- Dogs with good, gentle temperament
- Plants produce bigger fruit/veg
- Disease resistant crops
- 2.) Breed organisms/parents that have these characteristics
- Key words
- Breed-groups within a species that are all different (e.g A Poodle & Labrador same species different breed)
- Species - animals that can reproduce together to produce FERTILE offspring
- Uses
- Agriculture
- Improve meat yields farmer selects cows with characteristic of being big & breed them, doing this for several generations produces cows with high meat yield
- Inbreeding main problem - reduces gene pool (number of different alleles (type of gene) in a population) as 'best' animals/plants used for breeding so all closely related
- Cause health problems as more chance inheriting harmful genetic defects when gene pool limited
- Ethical considerations if animals bred to have negative characteristics for research
- If new disease appears not much variation so less chance of resistant alleles being present, all stock closely related, if disease kills one others likely to die
- Cause health problems as more chance inheriting harmful genetic defects when gene pool limited
- Inbreeding main problem - reduces gene pool (number of different alleles (type of gene) in a population) as 'best' animals/plants used for breeding so all closely related
- Plants that produce big fruit/veg
- Improve meat yields farmer selects cows with characteristic of being big & breed them, doing this for several generations produces cows with high meat yield
- Medical
- Investigating alcoholism rats bred for preference to alcohol and no preference researchers compare 2 types of rats, behaviour & how brain works
- Agriculture
- Humans artificially select plants/animals that will breed so genes for a particular characteristic remain in a poulation
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