BIOB51H3 Lecture Notes - Lecture 7: Bird Flight, Evgeny Kurochkin, Phenotypic Plasticity
9 Sep 2016
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Document Summary
Understanding check hypothetical steps in the origin of avian flight. Powered flight: modern feathers allow efficient gliding and true flight. Modern feathers allow efficient gliding & true flight: understanding check. Hypothetical steps in the origin of avian flight. Elaborated feathers permit parachuting (safe leaping from height) Feathers = aerodynamic, aid in leaping among braches. F1 generation increases diversity, on average, you look like your parents, but there is a little bit of variation. The distribution will move upwards when we look at the individuals that survive. This change in trait value over generations required 3 things: phenotypic variation, selection, genes (heritable traits) Not all new traits will lead to evolutionary change: sources of phenotypic variation, genetic. Differences in phenotype due to differences in individuals" genotypes: environmental. Differences in phenotype due to differences in external surroundings or conditions experienced by individuals: genotype x environment. Differences in phenotype due to differences in the effect of external conditions on individuals with different genotypes.
