BIO 201 Lecture Notes - Lecture 4: Antigenic Drift, Genetic Drift, Sexual Reproduction
2 Feb 2017
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Document Summary
Neutral mutations e. g. t-a at position 23666 on chromosome 12. This was in a sperm or egg cells (i. e. germline) The first individual to inherit this mutation had genotype. The other two possible genotypes are t/ t and a/ a (homozygotes) Eventually all three genotypes may become common in the population. T/ t, a/t, a/ a all have the same average survival in the population. Does not affect fertility or mating success: T/ t, a/t, a/ a all have the same average fertility and mating success in the population. If they cause bad effects (deleterious), individuals carrying them usually die or have low survival and or reproduction: deleterious mutations are usually quickly eliminated from the populations. When we sample a population, we don"t find them. Unless they are recessive- then they may increase to a low frequency by chance (or because in a part environment, they were advantageous)
