genetic diversity and adaptation 9.3 and directional selection 9.4 0.0 / 5 ? BiologyDNA, genetics and evolutionASAQA Created by: Joseph FurnivalCreated on: 26-04-18 15:27 How can a mutation be beneficial It can result in new alleles in a gene a new allele may also lead to increased reproductive success 1 of 15 what is genetic diversity The total number of different alleles in a population 2 of 15 what is the advantage of having a wider allele frequency more alleles passed on to help an organism survive 3 of 15 what is directional selection this may favour individuals that vary in one direction from the mean of the population 4 of 15 what is stabilising selection may favour average individuals 5 of 15 why was the effectiveness of antibiotics being reduced after its dicovery Bacteria had developed resistance this was because of a random mutation 6 of 15 what was the enzyme called that bacteria used to fight against penicillin penicillinase 7 of 15 what were these penicllin resistant bacteria able to do more able to survive and multiply in the presence of penicillin 8 of 15 which individuals are favoured in stabilising selection it is the individuals with phenotypes closest to the mean that are favoured 9 of 15 If babies have a weight which is not too big or too low why is this benenficial They are less likely to die and more likely to be favoured and preserve that characteristic. 10 of 15 what is natural selection Results in species that are better adapted to survive 11 of 15 what are the 3 types of adaptation Anatomical, physiological and behavioural 12 of 15 what is an anatomical adadptation is physical features eg shorter ears 13 of 15 what is a physiological adaptation eg oxidising fat rather than carbohydrates in kangaroo rat to produce additional water in dry environment 14 of 15 what is a behavioural adaptation A behaviour organisms have 15 of 15
Genetic information, variation and relationships between organisms AQA AS Biology PART 3 of 6 TOPICS: Genetic diversity and adaptation 5.0 / 5 based on 1 rating Teacher recommended
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