Biology 1001A Lecture Notes - Lecture 16: Frequency-Dependent Selection, Genetic Recombination, Sexual Reproduction
19 Feb 2016
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Cost of mate (finding a mate, attracting a mate) Cost of meiosis (only pass on 50% of your alleles, could inherit bad genes, diluting your genome by a factor of 2 each time) Cost of males (males can"t produce offspring on their own) Sexually reproducing species are more common than asexual reproducing sexually, asexual ones have a higher risk of extinction, asexual ones more recent. Sexual recombination benefits the population by speeding up evolution: discarding harmful mutations, combining beneficial mutations. Asexual lineages accumulate harmful mutations o: most mutations are harmful, more and more and more harmful mutations are accumulated over time, can"t get fewer if they reproduce asexually. Sex combines helpful mutations: breaks the rachet , continually creates new genotypes with fewer harmful mutation, rubies in the rubbish ( have fewer mutations than either of their parents. Sexual reproduction is safer, produces a diversity of offspring genotypes and phenotypes, increases likelihood of offspring being well adapted to environment.
