©JUSTTRACY EXAM SOLUTIONS
07/11/2024 10:28
BIO340 Exam 2 Questions And Revised Answers
You buy two sets of flowers from the same species, one set is only made of red
flowers, while the other is made of white flowers, and you know both sets were
produced by only red and white parents, respectively. Assume flower color is coded
by a single autosomal gene. After crossing red flowers with white flowers, all the
offspring are banded red and white. What can you say about the alleles R and W of
the flower color gene? - answers✔✔R and W are codominant
Your friend gets tested and the results are conclusive: she will not develop
Huntington's disease. What is the probability of her child having the disease now? -
answers✔✔0
Recessive mutations - answers✔✔The phenotype of a recessive mutation is seen
only in homozygous individuals.
Fully Dominant Mutations - answers✔✔The phenotype of a fully dominant mutation
is seen in both heterozygous and homozygous individuals.
Loss-of-function mutations - answers✔✔cause a gene to lose some or all of its
normal function
hypomorphic, null - answers✔✔Types of mutations
hypomorphic mutations - answers✔✔mutations that have lost only some of their
function.
Null mutations - answers✔✔mutations that have lost all of their function
haplosufficient - answers✔✔where a a single copy is sufficient to produce the wild-
type phenotype in the heterozygous genotype
haploinsufficient - answers✔✔a single copy is not sufficient to produce the wild-type
phenotype in the heterozygous genotype
gain-of-function - answers✔✔in which the gene product acquires a new function or
express increased wild type activity
codominance - answers✔✔both alleles for the same characteristic are
simultaneously expressed in the heterozygote
, ©JUSTTRACY EXAM SOLUTIONS
07/11/2024 10:28
incomplete dominance - answers✔✔one of the alleles appears in the phenotype in
the heterozygote, but not to the exclusion of the other, which can also be seen
Incomplete dominance. - answers✔✔If black and white true-breeding mice are
mated and the result is all gray offspring, what inheritance pattern would this be
indicative of?
Multiple alleles and codominance. - answers✔✔ABO blood groups are an example
of:
Yes, if each parent carries one i allele. - answers✔✔Could an individual with blood
type O (genotype ii) be a legitimate child of parents in which one parent had blood
type A and the other parent had blood type B?
Incomplete dominance - answers✔✔A white splashed (Bl/Bl) Andalausian chicken
and a black (bl/bl) Andalusian chicken are crossed. The heterozygotes produced
show an intermediate phenotype (blue). What inheritance pattern would this be
indicative of?
codominance - answers✔✔A person with only one Sickle Cell Anemia allele and one
unaffected allele will have some normal red blood cells and some abnormal. What
inheritance pattern would this be indicative of?
complementation tests - answers✔✔to determine if any of the mutations are in a
single gene, or if each mutation represents one of the several genes necessary for a
phenotype to be expressed
complementary gene interaction - answers✔✔Gene interaction occurs when two or
more genes affect the same phenotype, by influencing a common pathway, if two
genes do interact, there are fewer phenotypes than in the offspring of a typical
dihybrid cross
9:7 ratio
duplicate gene interaction - answers✔✔The genes in a redundant system have
duplicate gene action; they encode the same product, or they encode products that
have the same effect in a pathway or compensatory pathways. Whenever a
dominant gene is present, the trait is expressed.
15:1 ratio
dominant gene interaction - answers✔✔When both the genes are present together,
their phenotypic effect is increased as if the effects of the two genes were additive or
cumulative
9:6:1 ratio
07/11/2024 10:28
BIO340 Exam 2 Questions And Revised Answers
You buy two sets of flowers from the same species, one set is only made of red
flowers, while the other is made of white flowers, and you know both sets were
produced by only red and white parents, respectively. Assume flower color is coded
by a single autosomal gene. After crossing red flowers with white flowers, all the
offspring are banded red and white. What can you say about the alleles R and W of
the flower color gene? - answers✔✔R and W are codominant
Your friend gets tested and the results are conclusive: she will not develop
Huntington's disease. What is the probability of her child having the disease now? -
answers✔✔0
Recessive mutations - answers✔✔The phenotype of a recessive mutation is seen
only in homozygous individuals.
Fully Dominant Mutations - answers✔✔The phenotype of a fully dominant mutation
is seen in both heterozygous and homozygous individuals.
Loss-of-function mutations - answers✔✔cause a gene to lose some or all of its
normal function
hypomorphic, null - answers✔✔Types of mutations
hypomorphic mutations - answers✔✔mutations that have lost only some of their
function.
Null mutations - answers✔✔mutations that have lost all of their function
haplosufficient - answers✔✔where a a single copy is sufficient to produce the wild-
type phenotype in the heterozygous genotype
haploinsufficient - answers✔✔a single copy is not sufficient to produce the wild-type
phenotype in the heterozygous genotype
gain-of-function - answers✔✔in which the gene product acquires a new function or
express increased wild type activity
codominance - answers✔✔both alleles for the same characteristic are
simultaneously expressed in the heterozygote
, ©JUSTTRACY EXAM SOLUTIONS
07/11/2024 10:28
incomplete dominance - answers✔✔one of the alleles appears in the phenotype in
the heterozygote, but not to the exclusion of the other, which can also be seen
Incomplete dominance. - answers✔✔If black and white true-breeding mice are
mated and the result is all gray offspring, what inheritance pattern would this be
indicative of?
Multiple alleles and codominance. - answers✔✔ABO blood groups are an example
of:
Yes, if each parent carries one i allele. - answers✔✔Could an individual with blood
type O (genotype ii) be a legitimate child of parents in which one parent had blood
type A and the other parent had blood type B?
Incomplete dominance - answers✔✔A white splashed (Bl/Bl) Andalausian chicken
and a black (bl/bl) Andalusian chicken are crossed. The heterozygotes produced
show an intermediate phenotype (blue). What inheritance pattern would this be
indicative of?
codominance - answers✔✔A person with only one Sickle Cell Anemia allele and one
unaffected allele will have some normal red blood cells and some abnormal. What
inheritance pattern would this be indicative of?
complementation tests - answers✔✔to determine if any of the mutations are in a
single gene, or if each mutation represents one of the several genes necessary for a
phenotype to be expressed
complementary gene interaction - answers✔✔Gene interaction occurs when two or
more genes affect the same phenotype, by influencing a common pathway, if two
genes do interact, there are fewer phenotypes than in the offspring of a typical
dihybrid cross
9:7 ratio
duplicate gene interaction - answers✔✔The genes in a redundant system have
duplicate gene action; they encode the same product, or they encode products that
have the same effect in a pathway or compensatory pathways. Whenever a
dominant gene is present, the trait is expressed.
15:1 ratio
dominant gene interaction - answers✔✔When both the genes are present together,
their phenotypic effect is increased as if the effects of the two genes were additive or
cumulative
9:6:1 ratio
