Study Notes
Evidence for evolution includes fossil records, selective breeding, homologous structures, and patterns of variation. These demonstrate changes in heritable characteristics over generations.
- Fossil Evidence — Fossils are preserved remains or traces of organisms from the past. Example: Comparing hominin skeletons like Australopithecus and Homo sapiens shows evolutionary changes.
- Selective Breeding — Artificial selection by humans to produce desired traits in species. Example: Breeding dogs for specific traits like size or speed.
- Homologous Structures — Anatomical features similar in structure but different in function across species. Example: The pentadactyl limb in vertebrates like dolphins and bats.
- Speciation — The process where populations evolve into separate species. Example: Darwin's finches on the Galapagos Islands.
- Patterns of Variation — Continuous variation across geographical ranges leading to gradual divergence. Example: Variation in peppered moths due to environmental changes.
Exam Tips
Key Definitions to Remember
- Evolution
- Fossil Evidence
- Selective Breeding
- Homologous Structures
- Speciation
Common Confusions
- Difference between acquired and heritable characteristics
- Homologous structures vs. analogous structures
Typical Exam Questions
- What is fossil evidence? Fossils are preserved remains or traces of organisms from the past.
- How does selective breeding provide evidence for evolution? It shows how artificial selection can cause significant variation in a short period.
- What are homologous structures? Anatomical features that are similar in structure but different in function across species.
What Examiners Usually Test
- Understanding of how fossil records support evolution
- Examples of selective breeding and its impact
- Explanation of homologous structures and their significance