BIOS 101 Week 9
BIOS 101 Week 9 BIOS 101
Popular in Population and communities
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Popular in Biology
This 2 page Class Notes was uploaded by Kruti Merchant on Sunday March 13, 2016. The Class Notes belongs to BIOS 101 at University of Illinois at Chicago taught by Dr. Brown in Fall 2016. Since its upload, it has received 32 views. For similar materials see Population and communities in Biology at University of Illinois at Chicago.
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Date Created: 03/13/16
Microevolution Darwin thought that evolution took a LONG time. Galapagos Finches: One finch went from Peru to Galapagos. Eat different seeds => beak size. Beak size is heritable. Seed production plummeted to 3 years, birds were dying. Suddenly there was no drought and there were many seeds, Seeds got bigger so finches needed bigger beaks. In year 3 data, th beaks were bigger. Wood pecker: strong beak and rolled long tongue. None on Galapagos because there isn't that niche. Ecotypes: Wild yarrow Ex) House Sparrows: Always on campus. Don’t have evolutionary history till grain change. In Tucson they are lighter so they do not heat up as much. Human dominated landscape: We see evolution where we change their environment. Ex) City rats are better at mazes than country rats. Ex) City pigeons nest on cliffs and like human food. Ex) Dandelions that grow in the yards are different than those in forests. Natural life history is to grow as high as they can. Dandelions in lawn that grow high and flower ever 2 weeks is not preferred because we mow the lawn. Ex) Flour beetles. You expected to have them in your flour back in the past. As you use up more of the flour, the beetles increase in the sack. Flour beetles evolved to our store grain products. Ex) Squirrels. Red squirrels eat pine nuts. Around Purdue, a population of red squirrels settled in an oak forest. In two years the squirrels evolved to have smaller and stronger jaws. Ex) Cancer. Studied through genetics, study history (phylogenetics), and fit of form and function (adaptations). Liver cancer cell splits and has spikes. They are called abnormal. The normal cells that the cancer originated for are not abnormal. It is the derived state. Abnormal Cyto(something) Protuberence. Do the spikes have a purpose? Knowing what the spikes are for might help us treat the cells and to get rid of them. Nature is not an art gallery and species are not a master piece. Nature is a complex dynamical system, has a hierarchy, and it a product of natural selection. Microevolution: Evolutionary change within a lineage. Feature: Individuals cannot evolve, Populations evolve, when everyone is adapting, then the whole species has evolved. Allele to form genotype to give a phenotype. Mutation of alleles equals evolution. Ex) Bunnies. Phenotypic message, are looking and calculate for. Allele frequency is counting up all the alleles.
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