Selective Breeding (AQA GCSE Biology Combined Science): Flashcards
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What is selective breeding?
What is selective breeding?
When humans choose organisms to breed to produce offspring with desirable characteristics
Examples of desirable characteristics in selective breeding
Examples of desirable characteristics in selective breeding
Animals with more meat, plants with disease resistance, big flowers
Goal of selective breeding process
Goal of selective breeding process
All offspring have the desired characteristic (achieved through repeated breeding)
Main problem caused by selective breeding
Main problem caused by selective breeding
Inbreeding
What inbreeding means in selective breeding
What inbreeding means in selective breeding
Breeding closely related individuals
Effect of inbreeding on gene pool
Effect of inbreeding on gene pool
Reduction of gene pool - fewer different alleles
Risk from reduced gene pool
Risk from reduced gene pool
Species could become extinct if environment changes or new disease appears
Why reduced gene pool increases extinction risk
Why reduced gene pool increases extinction risk
All have same genetic make-up, less chance of survival advantage
Effect of small gene pool on genetic defects
Effect of small gene pool on genetic defects
Greater chance of genetic defects in offspring
Why small gene pool causes more genetic defects
Why small gene pool causes more genetic defects
Recessive characteristics more likely to be expressed