BIOL133 TEST 3 QUESTIONS AND VERIFIED ANSWERS| 100% CORRECT

BIOL133 TEST 3 QUESTIONS AND VERIFIED
ANSWERS| 100% CORRECT
Polygenic trait

a trait that is influenced by two or more genes

multifactorial trait

a trait that is influenced by both genes and the environment

mendelian trait

a trait that is influenced by only one gene

quantitative trait loci

DNA sequences that contribute to polygenic traits

false

TRUE OR FALSE: polygenic traits have all-or-none phenotypes

false

TRUE OR FALSE: the individual genes that contribute to a polygenic trait are dominant or
recessive to each other

false

TRUE OR FALSE: all genes that influence a polygenic trait contribute equally to the phenotype

true

TRUE OR FALSE: the graph of the frequency of phenotypes in a polygenic trait has the shape of
a bell curve

false

, TRUE OR FALSE: when a trait is polygenic, individuals cannot be categorized into classes with
respect to their phenotypes

true

TRUE OR FALSE: polygenic traits may be influenced by the environment

true

TRUE OR FALSE: DNA sequences that contribute to polygenic traits are called quantitative trait
loci

empiric risk

the chance that a polygenic multifactorial trait will occur in an individual

prevalence

the proportion of individuals in a population who have the disorder at a specific time

incidence

the number of new cases of a genetic disorder diagnosed per year in a population of a given
size

heritability

the proportion of phenotypic variance for a trait that is due to genetic differences in a
population

coefficient of relatedness

the proportion of genes that two people with a certain relationship share

concordance

among pairs of twins in whom at least one has a trait, _________ is the percentage of pairs in
which both twins express this same trait

false