LIFESCI 7B Lecture Notes - Lecture 11: Daphne Major, Genotype Frequency, Speciation
Document Summary
Hw equilibrium -- heterozygous state, a recessive allele could remain in the population even though it"s not as a advantageous to have. Which mode of selection began acting upon island fox body size upon colonization of the channel islands: directional. Tness curves plotted in 2 dimensions illustrate the tness of a single trait but selection acts on the individual and individuals have many traits controlled by multiple genes and epistatic interactions so not too realistics. Tness peaks on an adaptive landscape are often di erent heights, resulting in multiple trait combinations with high tness a population may become "trapped" on one peak despite the potential for higher tness on another peak. For speciation to occur, two populations must be reproductively isolated. Genetic di erences begin to accumulate between the two populations and the number of unique alleles between the populations will increase over many generations. New species arise when two populations have diverged su ciently from one another.
