Chapter 7 Vocabulary Definitions

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CHAPTER 7 VOCABULARY DEFINITIONS
Polygenic- Traits determined by more than one gene.
Multifactorial- A trait or illness determined by several genes and the environment.
Quantitative trait loci- Genes that determine polygenic traits.
Empiric risk- Probability that a trait will recur based upon its incidence in a population.
Incidence- The number of new cases of a disease during a certain time in a particular
population.
Prevalence- The number of cases of a disease in a population at a particular time.
Heritability- An estimate of the proportion of phenotypic variation in a group due to genes.
Coefficient of relatedness- The proportion of genes that two people related in a certain way
share.
Concordance- A measure indicating the degree to which a trait is inherited; percentage of twin
pairs in which both member express a trait.
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