Biology · Class 12 · Chapter 6
Evolution
13 lessons 101 min 2 simulations
This chapter tells the long story of life: how the universe, the earth and the first molecules of life arose, how Darwin explained the diversity of living forms by natural selection, and what evidence supports evolution. It then turns to the mechanism (mutation, Hardy-Weinberg equilibrium and the factors that upset it) and closes with a timeline of life forms and the origin of man.
What the exam asks
NEET asks for the Miller experiment's gases and product, homologous versus analogous examples, industrial melanism and resistance as selection in action, adaptive radiation examples, the Hardy-Weinberg algebra (p² + 2pq + q² = 1) and its five disturbing factors, the three types of selection, and the timeline and brain sizes of human ancestors. Marks are lost by swapping homology and analogy, by calling sweet potato and potato homologous, and by mixing up the brain capacities of Homo habilis, Homo erectus and Neanderthal man.
Lessons
13 lessons · 101 min
1Early earth and early ideasNCERT §6.17 min2Chemical evolution and the first lifeNCERT §6.17 min3Special creation and Darwin's theoryNCERT §6.26 min4Fossils and embryos as evidenceNCERT §6.37 min5Homology and analogyNCERT §6.37 min6Natural selection seen in actionNCERT §6.310 min 1 sim7Adaptive radiationNCERT §6.46 min8Biological evolution and Darwin's reasoningNCERT §6.57 min9Mutation and the Hardy-Weinberg principleNCERT §6.6, §6.710 min 1 sim10What disturbs the equilibriumNCERT §6.77 min11A brief account of evolutionNCERT §6.87 min12Origin and evolution of manNCERT §6.97 min13Chapter reviewMust-know facts, traps and formulas13 min