Biology › Evolution and speciation

Evolution and speciation

Unit B19 · 3 lessons published so far.

• Natural selection: variation, selection and allele frequency
  The three sources of genetic variation and which of them makes new alleles, environmental variation and why it is not inherited, selection pressure…
• Resistance, drift and the evidence: selection where you can watch it happen
  How antibiotic resistance arises and spreads, vertical and horizontal gene transfer, why a prescribed course is finished, pesticide and herbicide…
• Speciation: how one gene pool becomes two, and why the line is genuinely fuzzy
  The biological species concept and the cases it cannot handle, reproductive isolation and gene flow, allopatric speciation by geographical…