# Significant Elements

Jun 29th, 2015
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University of Chester, Chester and Warrington
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Population geneticists try to determine the extent to which a trait is determined by genetic factors and how much is determined by environmental factors. Knowing if a trait is largely determined by genetic factors introduces the possibility for animal and plant breeders to select and maintain populations with desired traits.

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Chapter 219Variation and Selection in PopulationsSynopsis:This chapter involves the study of how genetic laws impact the genetic makeup of a population. Mendelian principles are the basis for the Hardy-Weinberg law which allows one to calculate allele and genotype frequencies from one generation to the next. The Hardy-Weinberg law can be used only if other forces are not acting on the allele frequency. Those forces include selection, migration, mutation, and population size.Population geneticists try to determine the extent to which a trait is determined by genetic factors and how much is determined by environmental factors. Knowing if a trait is largely determined by genetic factors introduces the possibility for animal and plant breeders to select and maintain populations with desired traits.Significant Elements:After reading the chapter and thinking about the concepts, you should be able to:Determine allele frequencies in a population given the frequencies of genotypes.Determine genotype frequencies in a population given the frequencies of alleles.Determine genotype and/or allele frequencies in the next generation given the genotype or allele frequencies in the present generation.Determine if a population is in equilibrium.Determine allele and genotype frequencies after migration has occurred.Describe how heritability of a trait can be determined.Problem solving tips:p and q represent allele frequencies for a gene with two alleles; the sum of p + q mu

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