ECOL 3505H Lecture Notes - Lecture 11: Phenotypic Plasticity, Puffy Amiyumi, Quantitative Genetics
19 Sep 2016
School
Department
Course
Professor
Document Summary
R = phenotypic response to selection h = heritability. Estimating heritability (h2: low/no heritability = regression line should be almost flat; no correlation r=0, high heritability = regression line should be increasing and straight up; high correlation r=1. Phenotypic plasticity: the ability of the same genotype to produce different phenotypes under different environmental conditions. When dragonfly are abundant, the salamanders do not surface as frequently, to avoid the predators. To make up for the lack of oxygen, salamander larvae grow very big external gills (energetically unfavorable) When there are a lot of salamander larvae, tadpole larvae start growing very puffy and wide. Keeps salamander larvae from being able to eat them. ***researchers discovered this adaptation is probably from an autosomal chromosome and partially genetic. However, there is an environmental response as well. If there are a lot of dragonfly larvae but not a lot of salamanders, tadpole larvae will develop longer tails as to swim away faster.
