Topic 38Biology

D4.1 Natural selection

Variation, differential reproduction and inheritance drive allele-frequency change; Hardy-Weinberg assumptions; comparison with Lamarckism.

Variation and selectionSign up

Sources of variation · Selection pressures

Allele frequency changeSign up

Directional, stabilising, disruptive selection · Hardy-Weinberg principle (AHL)

Case studies in natural selectionSign up

Industrial melanism · Antibiotic resistance