BIOL 3040 Lecture : Evolution Lecture 1
Document Summary
Testing the sex ratio model: a rapid change of sex ratio: in an island (upolu) the butterflies maintained a near 1:1 sex ratio either by mutation or gene flow. Chapter 3: natural selection: process that leads to change in populations over time, most fit individuals make the greatest contribution to the gene pool. The components of natural selection: variation, inheritance, differential reproductive success. Are humans evolving: it has been observed that humans are getting taller over the past few decades, a trend like this can be attributed to better food and medical practices, possible sexual selection. Is there variation in the population: yes, for example height constantly varies. Is height heritable: data shows that height is indeed heritable. Shorter fathers tend to have shorter sons and the same with taller fathers: the genes identified indicate a correlation with one generation and the next, environmental factors can have an effect, ex.
