Bio Unit 4 Examples

Mainland vs Island Creatures

The Galapagos

Artificial Selection

Fancy pigeons or dogs

Disruptive Selection

African seed cracker finches beaks

Stabilizing Selection

Clutch size in robin’s nest

Directional Selection

Tongue length for anteaters

Natural Selection

Guppies of Trinidad, grant’s finches, peppered moths, pesticide resistance

Fossils

whales transition from land to sea

Homologous Structures

Vertebrate forearms

Embryonic Structures

pharyngal pouch and post-anal tail

Imperfect Structures

backwards photoreceptors in the human eye

Vestigal stuctures

pelvic bone in whales

Convergent evolution

streamlined bodies of marine predators

Biogeography

land reptiles in Hawaii

Phenotypic evolution

Variation in eastern rate snake

Speciation/Adaptive radiation

Darwins finches

Habitat isolation

squirrels on the north vs south rims of the Grand Canyon

Temporal isolation

Eastern and western spotted skunk

Behavioral isolation

boobie species

Mechanical isolation

Floral species morphologies and pollinators

Gametic isolation

Red and purple urchins

Reduced hybrid fertility

Mule

Genetic drift

Drosphila flies in Hawaiian islands

Allopatric Speciation

Little paradise king fischer

Sympatric speciation

Polyploidy

Punctual equilibrium

Cambrian explosion