Biology 1001A Lecture Notes - Lecture 15: Sexual Selection, Coevolution
Document Summary
Sexual reproduction is costly to individuals but maintained because of long-term benefits to the population. Increased genetic variation in the population, increased adaptive potential, lower risk of extinction. Sexual reproduction is costly to individuals, but maintained because of short-term benefits. Is producing a diversity of offspring genotype important for a desirable in a stable environment: the best way to do for maintaining constant fitness is asexual reproduction, most organisms are evolving. What if the environment is changing and unpredictable: different offspring genotypes, sexual reproduction can be favourable. Red queen principle: sex and evolutionary arms races. Sex is widespread despite being costly, risky, and inefficient, because the benefits of offspring diversity often outweigh the costs. Charles darwin is against peacocks; not beneficial to the environment. In many animals, one sex (but not the other) expresses costly traits that reduce survival. Sexual selection favours traits that improve ability to compete for, or attract, mates. Horns used for killing males to get mates.