IB Biology Topic A4.1 Evolution and Speciation (SL/HL) covers syllabus content as part of Topic A4: Ecosystems under Theme A: Unity and Diversity. Use these notes, questionbank, videos, flashcards, and lessons to review the topic, practise exam questions, and move between notes, videos, flashcards, and lessons where available.
A4.1 Evolution and speciation is part of Topic A4: Ecosystems under Theme A: Unity and Diversity.
What this topic covers
A4.1.1 Evolution as change in the heritable characteristics of a population
A4.1.2 Evidence for evolution from base sequences in DNA or RNA and amino acid sequences
A4.1.3 Evidence for evolution from selective breeding of domesticated animals and crop plants
A4.1.4 Evidence for evolution from homologous structures
A4.1.5 Convergent evolution as the origin of analogous structures
A4.1.6 Speciation by splitting of pre-existing species
A4.1.7 Roles of reproductive isolation and differential selection in speciation
A4.1.8 Differences and similarities between sympatric and allopatric speciation (HL)
A4.1.9 Adaptive radiation as a source of biodiversity (HL)
A4.1.10 Barriers to hybridization and sterility of interspecific hybrids (HL)
A4.1.11 Abrupt speciation in plants by hybridization and polyploidy (HL)