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Genetics Week 2 Exam 2

by: Jessica Brown

Genetics Week 2 Exam 2 BSCI - 30156 - 002

Jessica Brown

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About this Document

Exam 2 week 2 material
Chi-hua Groff (P)
Class Notes
Genetics, Biology
25 ?





Popular in Biological Sciences

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!


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