3.4 DIVERSITY & EVOLUTION

  1. Bonus stuff to help you

  2. Most common phrasing errors
    • Traits are passed on to the next generation
    • Organisms mutate to adapt to the environment
    • All mutations are inheritable and can be passed from one generation to the next
    • When mutations result in favorable alleles, they will then be passed on to the next generation


  3. Exam tips
    • Genetic drift ≠ antigenic drift
    • Genetic ≠ phylogenetic concept of species
    • Analogy ≠ biogeography ≠ convergent evolution; these words are not interchangeable
    • When explaining heterozygous advantage becareful which example you give and how you explain it. If you use the example of sickle cell trait then the co-dominance behavior should be described NOT masking of the recessive allele
    • Genetic drift, gene flow, natural selection and non-random mating DON’T create alleles. Mutations do. The 4 mechanisms only serve to change the allele frequencies
    • Isolated land mass doesn’t imply allopatric speciation. The organism involved have to be considered as well
    • Examiners frequently use non-standard terminology in this topic. The key is to correlate them to concepts you have learnt

SKILLS