Evolution
A finch on one island has a thick beak, and its cousin on another island has a thin one. A moth that was pale in your great-grandmother's time is dark today. How did the living world come to be this way? In this chapter you start with the first chemicals of life and the evidence that species change. Then you follow Darwin's idea of natural selection, and you count genes in a population with the Hardy-Weinberg principle. At the end you walk through the long history of life and the descent of the human species. It serves the Indian syllabus (NCERT, NEET) and the matching topic of A-Level, IB and AP. Python counts allele frequencies, runs selection and drift, dates fossils and builds trees.
Part of Biology · High School (11–12) (chapter 24)
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Origin of Life, Evidence and Darwin's Theory
How did life begin on a young Earth, and how do we know that species have changed? You meet the experiments on the origin of life, and the evidence from fossils, from the bodies of animals, from embryos and from molecules. Then you follow Darwin's idea of natural selection, with the moths of England, the finches of the Galapagos and the pouched mammals of Australia. It serves the Indian syllabus (NCERT, NEET) and the matching topic of A-Level, IB and AP.
Hardy-Weinberg, Selection, Drift and Speciation
Evolution is a change in the genes of a population from one generation to the next. You count alleles with the Hardy-Weinberg principle, and you find out why a real population drifts away from it. Then you meet the three kinds of natural selection, genetic drift, the founder effect and gene flow, and you see how all of this can end in a new species. It serves the Indian syllabus (NCERT, NEET) and the matching topic of A-Level, IB and AP.