The Topic about Occurrence of Evolution.pptx

The Topic about Occurrence of Evolution

1. The Occurrence of Evolution Evolution is a cornerstone of modern biology. It explains the diversity of life on Earth. This presentation covers the key aspects. It includes the definition, evidence, and mechanisms of evolution. CD by Charelle Honey Dumya-as

2. What is Evolution? Definition Evolution is a change in heritable traits. It happens in biological populations. These changes occur over successive generations. Key Components Natural selection drives evolution. Genetic drift also plays a role. Mutation and gene flow are other key factors.

3. Evidence for Evolution 1 Fossil Record Fossils show the history of life on Earth. They document the transition of species over time. 2 Comparative Anatomy Similarities in anatomy point to common ancestry. Homologous structures demonstrate shared evolutionary paths. 3 Molecular Biology DNA and genetic evidence support evolution. Genetic code similarities reveal relationships between organisms.

4. Natural Selection: The Primary Mechanism More offspring More offspring are produced than can survive. Variation in traits Individuals show variation in their traits. Survival and reproduction Differential survival and reproduction occur based on traits. Heritability Fitness is heritable.

5. Timescales of Evolution 1 Microevolution These are short-term changes within populations. 2 Macroevolution Macroevolution involves large-scale changes over extended periods. 3 Example Consider house sparrows in North America. This occurred from the 19th century to the present.

6. Observable Evolution in the Wild Climate Adaptations Climate change drives adaptations. Examples include squirrels and mosquitoes. Antibiotic Resistance Bacteria evolve antibiotic resistance. This poses a major challenge to healthcare. Pesticide Resistance Insects develop pesticide resistance. This impacts agriculture.

7. The Tree of Life Common Ancestry All living organisms share common ancestry. 1 Branching Pattern Evolutionary relationships have a branching pattern. 2 LUCA The Last Universal Common Ancestor existed ~3.5-3.8 billion years ago. 3

8. Conclusion: Evolution as an Ongoing Process Continuous Adaptation Evolution enables adaptation to changing environments. Implications Evolution impacts biodiversity and species conservation. Future Evolution will shape humanity and other species.