AQA GCSE Combined Science: Trilogy (8464) — Biology — Foundation · 4.6.2.3
Revise AQA GCSE Combined Science: Trilogy (8464) — Biology — Foundation specification point 4.6.2.3, Selective breeding, with free active-recall flashcards. Flip through the set or review every question and answer below.
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How is selective breeding carried out?
Humans identify a desirable inherited feature, choose and cross parents showing it, then select offspring showing it as parents for the next generation. Selection and crossing are repeated over many generations.
What can repeated selective breeding achieve in crop plants and domesticated animals?
It can increase desirable features over many generations.
What type of selection is selective breeding?
Artificial selection.
How does selective breeding increase food production?
Crop plants or livestock with desirable inherited characteristics are chosen as parents over successive generations. Productive characteristics become more common in their offspring, increasing food yield.
What three types of characteristics can humans select through breeding?
Useful, behavioural or appearance-related characteristics.
What are two examples of characteristics selected for in agriculture?
Disease resistance in food crops and greater meat or milk production in farm animals.
What is inbreeding in selective breeding?
Breeding closely related individuals together.
What effect can inbreeding have on genetic variation?
It reduces genetic variation.
Why can inbreeding make a breed more prone to inherited defects or disease?
It increases the chance that offspring inherit two copies of a harmful recessive allele.