A4.1 Evolution and Speciation - IB Biology New Curriculum 2025

All IB Biology Content Videos: https://sites.google.com/view/ibbiolo... This video covers A4.1 Evolution and Speciation for the new IB Biology curriculum (first assessment 2025). It covers the following content: SL and HL: 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 in proteins 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 Additional HL Content: A4.1.8—Differences and similarities between sympatric and allopatric speciation A4.1.9—Adaptive radiation as a source of biodiversity A4.1.10—Barriers to hybridization and sterility of interspecific hybrids as mechanisms for of preventing the mixing of alleles between species A4.1.11—Abrupt speciation in plants by hybridization and polyploidy