Seeing is Believing: Evolution in your Classroom Anne Royer & Jay Sobel

pre test here

review the necessary requirements 3 necessities for evolution by natural selection phenotypically variable population relationship between a trait and fitness genetic basis to trait (heritable) other necessities specific to classroom something that reproduces quickly enough to see several generations in one semester or year organisms that are easy to obtain and maintain at least 2 selective environments easy to measure traits with simple tools others generated by teachers

Phenotypic Variation

Relationship between Trait and Fitness (Selection)

Genetic Basis to Trait (Heritability)

Artificial Selection Human imposed selection “Test” for Heritability R = h2S response to selection = heritability x selection strength Used for plant and animal breeding for thousands of years

Connecting Artificial Selection to Natural Selection Selection imposed by “environment” could include abiotic sources like climate, soils, etc. biotic sources like mutualists or predators Strength of selection imposed may be strong or weak (unlike artificial selection), but lots of time involved