Biological Ev

Artificial selection

• have an organism, humans see something they like in it, breed it to get more with certain trait
• eg. breeding dogs
• need someone to do selecting, need variation in traits the organisms have, need heredity, eg. have dogs with needed traits
• human breeder

Natural selection

• natural pressures are breeding, eg. predation, drought
• fitness
• > best adapted to selection pressures of a certain environment, passing on more genes to next generation, are most fit
• eg. finches on galapagos from common ancestor, Darwin saw differnt islands ahd different finches (insect eaters, seed eaters, fruit eaters), shape of beaks differed, some groups of finches became adapted to certain food source, eg thinner beak so get insects =…