Evolution Exam 1 Study Guide
Evolution Exam 1 Study Guide BIOL 312
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This 2 page Study Guide was uploaded by Leanna Widhalm on Saturday February 20, 2016. The Study Guide belongs to BIOL 312 at University of North Dakota taught by Professor Simmons in Spring 2016. Since its upload, it has received 35 views. For similar materials see Evolution in Biology at University of North Dakota.
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Date Created: 02/20/16
January 25, 2016 All organisms derive from a single common ancestor: know this by DNA Phylogeny: History of a group of species Phylogenetic tree: Summary of the History Going down the phylogenetic tree, going back in time Going across shows diversity Characters must be independent from one another and homologous Traits are homologous and modified in an ancestor = synapomorphies Examples of synapomorphies: Hair in mammals, feathers in birds, jointed legs in insects Characters seem to be homologous, but may be revealed to be convergent Change back to original character state (ancestral state) = reversal Use a phylogeny to track disease evolution and host choice Outline typical evolutionary experiments Distinguish between evolutionary tradeoffs and genetic constraints Discuss sexual asymmetry & predict which sex will be choosy or promiscuous Trade-Offs and Constraints H1: The more closely female flowers resemble male flowers, the more they are visited by bees Looks like stabilizing selection H2: The more closely female flowers resemble the most rewarding male flowers, the more often then will be visited by bees Looks like directional selection Plants depend on pollinators for sex Stabilizing selection limits variation in a species Directional selection – adapts to get better with “fitness” – reproduction The more flowers there are in a bunch, the smaller the flower is. The less amount of flowers there are in a bunch, the bigger the flower is. Fuscia – When the plant is green, pollination occurs. When it is green it produces nectar and while the pollinating happens, the plant turns red. When the flower is red, it doesn’t produce nectar Butterflies are the only insect that can see red. Know how to construct pedigrees Evolution of HIV History of Evolution Birds and mating, competition, tradeoff/constraints
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