ANTH 1001 Lecture Notes - Natural Selection, Daphne Major
Document Summary
Observations: population have the potential to increase infinitely, populations tend to remain constant over time. There is a struggle for survival: all species are variable, some variations are more advantageous to survival and reproduction, some variation is inherited. Advantageous features will become more frequent in a population through time. Natural selection on daphne major (peter and rosemary grant) In a variable species of bird, there were variations in size and beaks. 1977 -- major drought, larger beaked birds began eating different type of seed, large beaked birds. 1984 -- torrential rains, overproduction of plants, larger birds couldn"t get through plants to find food, survived, next generation had larger beaks smaller birds survived, next generation was smaller. Darwin took lamarck"s theory about individuals and applied it to an entire population. The conditions of selection do not include survival, natural selection is about reproduction. Typically, traits that help us to survive also increase our reproductive success (survive longer, reproduce more.
