Genetics Week 2 Exam 2
Genetics Week 2 Exam 2 BSCI - 30156 - 002
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BSCI - 30156 - 002
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This 2 page Class Notes was uploaded by Jessica Brown on Monday February 29, 2016. The Class Notes belongs to BSCI - 30156 - 002 at Kent State University taught by Chi-hua Groff (P) in Fall 2015. Since its upload, it has received 34 views. For similar materials see ELEMENTS OF GENETICS in Biological Sciences at Kent State University.
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Date Created: 02/29/16
Genetics Exam 2 Week 2 Notes Genome: DNA sequence Genome Output: the functions Plasticity: ability to vary Biggest Mendel Exception: most genes are polygenic Quantitative Trait: same qualitative trait loci varies Quantitative trait loci: a region of a chromosome. It can contain one or several genes Additive Loci: epistasis interactions Recall epistasis: different alleles around the genome interacting It can add together to be good Subtract to be bad Or equal out and have no effect Correlated Selection: independent genetic variation in two or more traits but selection favors some combination of character states over the other Example: snake patterns vs escape speeds o Pleiotropy Norms of reaction: similar genome but different phenotypes Heritability Heritability: all traits of a biological organisms are influenced by genetics and the environment Especially true with quantitative traits At population level—not individuals Focus on how variation—both genetic and environmental—will affect the phenotypic results Quantitative Traits: complex continuous traits—a lot of variation Occur at quantitative trait loci’s (QTL’s) Heritability Value Between 0 and 1 If phenotypic variation in a group was entirely due to genetic factors o Heritability will have value of 1 If phenotypic variation was entirely due to environmental factors o Heritability will have a value of 0 Most cases will NOT have value of 1 or 0. It will be a decimal between 1 and 0. Variance: variation around the mean Phenotypic Variance: total variance of population, includes variation from genes and environment Genetic Variance: variance due to variation among individuals in alleles they have, excludes environmental caused variation Environmental Variation: variance due to environment Phenotypic variance Vp=Vg+Ve Genetic Variance (Vg)= additive V + Dominance V Vg=Va+Vd Therefore, Vp=Va+Vd+Ve 2 Broad Sense Heritability: H =Vg/Vp Narrow Sense Heritability: h :Va/Vp Equations are not given on the exam!