AQA GCSE Biology - Variation and Evolution Exam Questions and Answers 100% Correct

AQA GCSE Biology - Variation and Evolution Exam Questions and Answers 100% Correct What is variation? - Answer️️ -The differences in characteristics of individuals in a population Give three factors that can cause variation in a species - Answer️️ -1. Inherited genes. 2. environmental conditions. 3. A combination of genes and environment Where do variants in genes arise from? - Answer️️ -Mutations What is a mutation? - Answer️️ -A change in the base structure of DNA What effect can mutations have? - Answer️️ -Most have no influence on phenotype, some are harmful, some are beneficial What is evolution? - Answer️️ -A change in the inherited characteristics of a population over time through a process of natural selection What does the theory of natural selection state? - Answer️️ -All species of living things have evolved form simple life forms that first developed more than 3 billion years ago How did natural selection happen? - Answer️️ -There is natural variation in a species. A selection pressure occurs. The best adapted organisms survive for longer and reproduce more. Their offspring inherit the beneficial characteristics What is a species? - Answer️️ -Organisms that can breed together to make fertile offspring What is selective breeding? - Answer️️ -Breeding plants or animals for specific genetic characteristics How is selective breeding carried out? - Answer️️ -Choose the parents with the desired characteristics and breed them together. Choose the offspring with the desired characteristics and breed them. Continue this over many generations.