BIOL 59200 Lecture Notes - Lecture 3: Snow Goose, Melanocortin 1 Receptor, Group Selection
10 Jan 2019
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Document Summary
Melanocytes produce melanin that controls the pigment of hair, skin, or feathers. Melanocortin-1 receptor (mc1r) encodes a receptor that regulates the amount and type of melanin synthesis. Lesser snow geese come in either white or blue with color influencing mate selection. Rock pocket mice come in either dark black or sandy with color influencing which habitat they will do best in. Wynne-edwards model of group selection states that selfish individuals over- exploit their resources and die out compared to groups of altruistic individuals. However, individual selection is more powerful than group selection. Phenotypic plasticity: ability of a single genotype to alter its phenotype in response to environmental conditions or the capacity of a genotype to produce different phenotypes according to the environment in which the individual develops. Can be either adaptive or reflect physiological effects. Daphnia clones raised in the chemical presence of predators had larger rostrum size compared to those raised in the absence of chemical.
