04 Mechanisms Speciation Coevolution

Terminology you should know

speciation . synthetic theory . allopatric and sympatric speciation . hybrid depression . allopolyploidy . U-triangle . coevolution .  


Concepts you should know, be able to explain, and remember

  • You can explain, what the term "allopatric" and "sympatric" speciation means

  • You can explain, why Mayr's speciation theory does not work well in plants

  • You can explain, how species barreers are maintained in Salvia

  • You can explain, why Darwin had problems to explain Angiosperm radiation and what the answer to his "abominable mystery" is


To think about

  1. Rapeseed (Brassica napus) is a allopolyploid from Brassica rapa and Brassica oleraceae. Sketch down the chromosomes in meiosis I of a hybrid B. napus x B. rapa and a hybrid B. napus x B. oleraceae.
  2. What happens if a mutant in the pin6 transporter (needed for staminal elongation) becomes recessive in Salvia glutinosa growing sympatrically with Salvia pratensis?
  3. Many plants attract pollinators by mimicking their sexual signals - why confers this strategy a selective advantage?  
  4. What would happen, if Howea balmoriana would be forced to grow on the coral reef?


To read and deepen