isolation and speciation

• what is the definition of species

  a group of phenotypically similar organisms that can interbreed to produce fertile offspring
• what must organism be able to produce to be a species

  to produce fertile offspring
• what is a deme

  interbreeding sub units that share a distinct gene pool
• when will happen when populations of a species are isolated for a long period of time

  they will speciate and form a new species over time
• what is the definition of speciation

  Formation of new species
• how will you know that a species has changed so much and formed a new species

  the new species will not be able to reproduce to have fertile offspring with the original species
• when will speciation occur

  when a species become reproductively isolated
• what three factors cause speciation to occur

  Genetic drift , the founder effect and natural selection
• What is genetic drift?

  A change in allele frequencies caused by random events
• what are the 2 main types of speciation

  allopatric and sympatric