BIOB51H3 Lecture Notes - Lecture 7: Bird Flight, Phenotypic Plasticity, Evgeny Kurochkin
1 Mar 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. Feathers = aerodynamic, aid in leaping among braches check. Hypothetical: understanding steps in the origin of avian flight. Elaborated feathers permit parachuting (safe leaping from height) 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. Difference in a gene that is responsible for our ability to taste bitterness in food. Avi and pav effect the perception of bitterness in food. Avi avi eats more veggies, pavpav avoids more toxins: sources of phenotypic variation, genetic.
