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ISOLATION AND SPECIATION - Coggle Diagram

- - - - pre- zygotic barrier- temporal, behavioural, mechanical, gametic
      - Post-zygotic- hybrid inviability, sterility
- - - - AUTOPLOIDY- chromosome duplication within a single species
      - ALLOPLOIDY - hybridization + chromosome duplication between two species
- - - - temporal and behavioural isolation
- - - - Temporal isolation
      - Gametic isolation- biochemical incompatiblity- sperms cannot fertilize egg
      - Ecological isolation- occupy different habitats in same area
      - Mechanical isolation- physical incompatibility of reproductive organs
      - Behavioral isolation- difference in courtship rituals
    - - Hybrid inviability - zygote fails to develop or dies early
      - Hybrid sterility- cannot reproduce
      - hybrid offsprings are weak or infertile