Evolution Notes for NEET

Evolution Notes: Theories, Evidence, and Human Ancestry

Evolution notes should organise content around four pillars: origin of life, evolution theories, evidence of evolution, and human evolution. Origin of life covers the transition from chemical evolution (formation of organic molecules in the primordial soup) to biological evolution (self-replicating RNA molecules, protocells). The Oparin-Haldane hypothesis and Miller-Urey experiment are directly tested. Evolution theories require clear comparison between Lamarckism (inheritance of acquired characters, now disproved), Darwinism (natural selection acting on inherited variation), and the Modern Synthetic Theory (combining Darwinism with Mendelian genetics and population genetics). Evidence of evolution includes homologous organs (same structure, different function, e.g., forelimbs of whale, bat, horse), analogous organs (different structure, same function, e.g., wings of butterfly and bird), vestigial organs (reduced non-functional structures, e.g., human appendix), and molecular evidence (DNA sequence similarity indicating common ancestry).