IGCSE›Edexcel IGCSE Biology›Mind mapsSelective BreedingEdexcel IGCSE Biology: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsWhat it isHumans choose organisms with desired traitsDifferent from natural selectionAlso called artificial selectionRepeated over many generationsThe cycle Choose parents showing the trait most Breed those parents together Select the best offspring Breed the selected offspring Repeat until all show the trait In plantsHigher crop yieldDisease and pest resistanceFaster growth or earlier ripeningBetter taste, size or nutritionWheat bred for shorter stems, more grainSelective breedingartificial selectionIn animalsHigh milk yield in dairy cattleFast growth and meat yieldHigh egg production in hensDocile temperament, easier to handleFish farms also use it for yieldPros and consHigher yields improve food securityReduces genetic variationPopulation vulnerable to a new diseaseInbreeding raises inherited defectsExam tipsMention repeated generations of the cycleGive the disadvantage too: reduced variation