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
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
