Genetics Chapter 5 Study Guide
Question and answers rated A+ 2025
explain how lethal alleles can disrupt mendelian phenotypic ratios - correct
answer ✔eliminate a progeny class that Mendel's laws predict should exist
explain how multiple alleles can disrupt mendelian phenotypic ratios - correct
answer ✔create the possibility of more than two phenotypic classes.
explain how incomplete dominance can disrupt mendelian phenotypic ratios -
correct answer ✔introduces a third phenotype for a gene with two alleles
explain how codominance can disrupt mendelian phenotypic ratios - correct
answer ✔introduces a third phenotype for a gene with two alleles
explain how epistasis can disrupt mendelian phenotypic ratios - correct
answer ✔eliminates a progeny class when a gene masks another's
expression
explain how incomplete penetrance can disrupt mendelian phenotypic ratios -
correct answer ✔produces a phenotype that does not reveal the genotype
explain how variable expressivity can disrupt mendelian phenotypic ratios -
correct answer ✔can make the same genotype appear to different degrees
explain how pleiotropy can disrupt mendelian phenotypic ratios - correct
answer ✔can make the same genotype appear as more than one phenotype
because subsets of effects are expressed
, explain how a phenocopy can disrupt mendelian phenotypic ratios - correct
answer ✔mimics inheritance, but is an environmental effect
explain how genetic heterogeneity can disrupt mendelian phenotypic ratios -
correct answer ✔conditions with the same symptoms but caused by different
genes will not recur with the frequency that they would if there was only one
causative gene
how does the relationship between dominant and recessive alleles of a gene
differ from epistasis? - correct answer ✔Dominant and recessive alleles are
of the same gene. Epistasis is an interaction of alleles of different genes.
Why can transmission of an autosomal dominant trait with incomplete
penetrance look like autosomal recessive inheritance? - correct answer ✔it
can skip generations in terms of phenotype
how does inheritance of ABO blood types exhibit both complete dominance
and codominance - correct answer ✔the I^A allele is codominant with the I^B
allele; both are completely dominant to i
how could two people with albinism have a child who has normal skin
pigment? - correct answer ✔genetic heterogeneity (mutations that parents
carry are in different genes)
name two diseases discussed in the chapter that demonstrate genetic
heterogeneity - correct answer ✔retinal dystrophy, alzheimer disease
explain ways that genome sequencing is showing that phenomena that we
once thought were exceptions to mendel's laws and quite rare are actually
more common - correct answer ✔identification of new genes and associating
Question and answers rated A+ 2025
explain how lethal alleles can disrupt mendelian phenotypic ratios - correct
answer ✔eliminate a progeny class that Mendel's laws predict should exist
explain how multiple alleles can disrupt mendelian phenotypic ratios - correct
answer ✔create the possibility of more than two phenotypic classes.
explain how incomplete dominance can disrupt mendelian phenotypic ratios -
correct answer ✔introduces a third phenotype for a gene with two alleles
explain how codominance can disrupt mendelian phenotypic ratios - correct
answer ✔introduces a third phenotype for a gene with two alleles
explain how epistasis can disrupt mendelian phenotypic ratios - correct
answer ✔eliminates a progeny class when a gene masks another's
expression
explain how incomplete penetrance can disrupt mendelian phenotypic ratios -
correct answer ✔produces a phenotype that does not reveal the genotype
explain how variable expressivity can disrupt mendelian phenotypic ratios -
correct answer ✔can make the same genotype appear to different degrees
explain how pleiotropy can disrupt mendelian phenotypic ratios - correct
answer ✔can make the same genotype appear as more than one phenotype
because subsets of effects are expressed
, explain how a phenocopy can disrupt mendelian phenotypic ratios - correct
answer ✔mimics inheritance, but is an environmental effect
explain how genetic heterogeneity can disrupt mendelian phenotypic ratios -
correct answer ✔conditions with the same symptoms but caused by different
genes will not recur with the frequency that they would if there was only one
causative gene
how does the relationship between dominant and recessive alleles of a gene
differ from epistasis? - correct answer ✔Dominant and recessive alleles are
of the same gene. Epistasis is an interaction of alleles of different genes.
Why can transmission of an autosomal dominant trait with incomplete
penetrance look like autosomal recessive inheritance? - correct answer ✔it
can skip generations in terms of phenotype
how does inheritance of ABO blood types exhibit both complete dominance
and codominance - correct answer ✔the I^A allele is codominant with the I^B
allele; both are completely dominant to i
how could two people with albinism have a child who has normal skin
pigment? - correct answer ✔genetic heterogeneity (mutations that parents
carry are in different genes)
name two diseases discussed in the chapter that demonstrate genetic
heterogeneity - correct answer ✔retinal dystrophy, alzheimer disease
explain ways that genome sequencing is showing that phenomena that we
once thought were exceptions to mendel's laws and quite rare are actually
more common - correct answer ✔identification of new genes and associating
