Please enable JavaScript.
Coggle requires JavaScript to display documents.
Mechanism of Evolution (Genetic Drift (founder effect ((randomly, small…
Mechanism of Evolution
Genetic Drift
founder effect
randomly, small group has different gene
genetic change from original population
small group is separated from population
new species or subspecies evolves
physical barrier
Allopatric speciation
Isolation keeps genes from remixing into original group
gene pool is smaller
new group forms and cannot interbreed with oirginal = new species
Bottleneck
remaining population genetically different
change in the genetic makeup of the new population
disaster kills off lg part of population
Coevolution (evolutionary relationship)
mutualistic relationship
Both organisms evolve together by benefiting each other
Commensalistic relationship
Changes in one species enhances the evolution of the other
parasitic relationship
host evolves better defenses
so each keeps evolving in response to the others evolution
parasite evolves to avoid host defense
Reproductive Isolation