Speciation

• What is adaptive radiation?

  Diversification from an ancestral species
• What triggers adaptive radiation?

  New resources or environmental changes
• What is sympatric speciation?

  Speciation without geographical barriers

  
• What are reproductive isolating mechanisms?

  Mechanisms that maintain species integrity
• What are pre-zygotic isolating mechanisms?

  Mechanisms preventing zygote formation
• What is habitat isolation?

  Organisms live in different environments
• What is behavioral isolation?

  Mating behaviors are not recognized by others
• What is temporal isolation?

  Different reproductive times of year
• What is mechanical isolation?

  Reproductive parts do not fit together
• What is gametic isolation?

  Sperm and egg do not recognize each other
• What are post-zygotic isolating mechanisms?

  Prevent viable offspring after fertilization
• What is reduced hybrid viability?

  Hybrid organism cannot survive long
• What is reduced hybrid fertility?

  Hybrid organism survives but cannot reproduce
• How do hummingbirds and flowers benefit from coevolution?

  Flowers provide nectar; hummingbirds pollinate
• What is allopatric speciation?

  Speciation due to geographical barriers

  
• What is parapatric speciation?

  Speciation due to extreme habitat changes
• What must occur for speciation to happen?

  Populations must become reproductively isolated
• How do plants around mines illustrate parapatric speciation?

  They develop distinct characteristics due to habitat