LIFESCI 15 Lecture Notes - Lecture 4: Allele Frequency, Master Sergeant, Sexual Selection
Document Summary
Survival doesn"t really matter, reproduction is what really matters. An organism with greater reproductive success than other individuals in the pop. Fitness is the relative reproductive success of a phenotype or genotype. Alleles that confer the highest fitness on the individuals carrying them will increase their market share in a pop. over time. A direct alteration of dna so that one allele is changed to another. Really rare; over a long period of time, mostly bad or neutral changes. Within a pop, some individuals leave or new individuals arrive, changing overall allele frequencies. Evolution can occur via one of four agents: mutation, migration, drift, or natural selection. Often, there is conflict between reproduction and survival. Behaviors that decrease the probability of survival but increase the likelihood of attracting a mate & obtaining matings. Is there a human nature? (what does that mean?) Show someone a snake sweaty skin, increased heart rate. Same response in all countries and in all cultures.
