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Week Six (28 Sept.-2 Oct. 2015) BIOL 2040 Population Ecology (Cont.)

by: Chris Hicks

Week Six (28 Sept.-2 Oct. 2015) BIOL 2040 Population Ecology (Cont.) BIOL 2040

Marketplace > Bowling Green State University > Biological Sciences > BIOL 2040 > Week Six 28 Sept 2 Oct 2015 BIOL 2040 Population Ecology Cont
Chris Hicks
GPA 3.955
Concepts in Biology I
Daniel Pavuk

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About this Document

Lab topics and Friday's notes for the week including population ecology.
Concepts in Biology I
Daniel Pavuk
Class Notes
Population ecology, carrying capacity, genes, dominance, life history, growth
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This 3 page Class Notes was uploaded by Chris Hicks on Sunday October 4, 2015. The Class Notes belongs to BIOL 2040 at Bowling Green State University taught by Daniel Pavuk in Fall 2015. Since its upload, it has received 21 views. For similar materials see Concepts in Biology I in Biological Sciences at Bowling Green State University.

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Date Created: 10/04/15
Week Six 28 Sept2 Oct 2015 BIOL 2040 Population Ecology Cont Lab segment of DNA coding for specific protein M Specific form of a gene Genotyp genetic composition PhenotypeWhat s seen Homozygous gene pair has same 2 alleles Heterozygousunlike alleles Dominanceexpressed allele Incomplete dominanceblending of phenotypes Codominanceboth alleles expressed equally Without blending Punnett Squares get ratios of genotypesphenotypes quickly Polygenic inheritanceheight is example multiple genes control same trait Multiple alleles blood type is example Xlinked males haploid for xalleles meaning they get recessive on Xchromosome automatically example colorblindness Class Carrying Capacity Kexponential growth can t be sustained because of limited resources maximum population size that can be supported by the environment the population s in can vary determined by abundance of various resources more realistic population modellogistic growth model Logistic Growth Model dNdtrmaXNKNK produces sigmoid sshaped curve there are organisms that exhibit this type of growth fungi bacteria etc when grown in constant environment some organisms overshoot K females have extra energy in fat stores which can cause overshoot if food becomes limiting for population then its growth eventually declines some populations greatly uctuate the LGM fits few populations but is important in conservation Life History Traits help produce Natural Selection favors 2 traits 1 survivorship 2 reproductive success There are tradeoffs between survival and reproductive traitsreproductive frequency number of offspring litterclutch size investment in parental care Organism s Life Historyorganism s development physiology behavior Evolution accounts for large diversity Life History Traits 1 When reproduction begins age at 1St reproduction maturity ex Loggerhead Turtle 1 30 years old 4 clutches in 1 year300 eggs reproduces every few years and lays eggs for next 30 years 2 How often does organism reproduce 3 How many offspring produced reproductive diversity Semelparitvreproduce once a lot of offspring no parental care and a lot of mortality ex Coho Salmon Iteroparitvadults survive for long time reproduce multiple times fewer offspring each time more resources for them better provisioning 2 Factors for Evolution of Semelparitv vs Iteroparitv 1 Offspring s survival rate lowhighly variableunpredictable environments semelparity less adults survive also iteroparitymore dependable environments more survivorship 2 Likelihood adults survive and reproduce again many organism have intermediate life histories ex Oak trees and sea urchins


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