GENETICS EXAM I QUESTIONS AND
100% CORRECT ANSWERS
1:2:1
what will be the genotypic ratio in the offspring of two Aa
parents that are crossed with each other?
the allele for round seeds is dominant to the allele for
wrinkled seeds
when Mendel crossed a plant homozygous for round
seeds to another plant homozygous for wrinkled seeds, he
found that the progeny had round seeds. how is this
explained?
how well the observed results of a genetic cross fit
the expected values
what information can the chi-square goodness-of-fit test
provide?
2
the principle of independent assortment involves at least
how many different gene pairs?
law of segregation
an individual possesses two allele at a locus and these
two alleles separate when gametes are formed, one allele
going into each gamete. this genetic concept is known as
what?
phenotype
what is the physical appearance or manifestation of a
characteristic called in genetics?
dihybrid cross
, what is a cross that occurs between two individuals that
differ in two characteristics?
the A allele is dominant to the a allele
if a plant has a genotype of Aa, we would assume what?
meiosis
mendel's principle of segregation can be explained by
what process?
all will be AaBb
a cross between an AABB individual and an aabb
individual will produce what type of offspring?
1:1
if an Aa individual is crossed to an aa individual, what will
be the phenotypic ratio in the offspring?
an affected individual in a pedigree who brings the
family to the attention of the medical community
what is a proband?
all
if a man exhibits a y-linked trait, what proportion of his
sons should also be affected?
none
a trait shows x-linked dominant inheritance. a normal
daughter of an affected mother marries a normal man.
what proportion of their children will be affected?
they can be passed from father to son
which of the following statements about x-linked recessive
traits is false?
an affected man can pass on the trait to his son
which of the following cannot occur with x-linked dominant
inheritance for a rare trait?
1/2
100% CORRECT ANSWERS
1:2:1
what will be the genotypic ratio in the offspring of two Aa
parents that are crossed with each other?
the allele for round seeds is dominant to the allele for
wrinkled seeds
when Mendel crossed a plant homozygous for round
seeds to another plant homozygous for wrinkled seeds, he
found that the progeny had round seeds. how is this
explained?
how well the observed results of a genetic cross fit
the expected values
what information can the chi-square goodness-of-fit test
provide?
2
the principle of independent assortment involves at least
how many different gene pairs?
law of segregation
an individual possesses two allele at a locus and these
two alleles separate when gametes are formed, one allele
going into each gamete. this genetic concept is known as
what?
phenotype
what is the physical appearance or manifestation of a
characteristic called in genetics?
dihybrid cross
, what is a cross that occurs between two individuals that
differ in two characteristics?
the A allele is dominant to the a allele
if a plant has a genotype of Aa, we would assume what?
meiosis
mendel's principle of segregation can be explained by
what process?
all will be AaBb
a cross between an AABB individual and an aabb
individual will produce what type of offspring?
1:1
if an Aa individual is crossed to an aa individual, what will
be the phenotypic ratio in the offspring?
an affected individual in a pedigree who brings the
family to the attention of the medical community
what is a proband?
all
if a man exhibits a y-linked trait, what proportion of his
sons should also be affected?
none
a trait shows x-linked dominant inheritance. a normal
daughter of an affected mother marries a normal man.
what proportion of their children will be affected?
they can be passed from father to son
which of the following statements about x-linked recessive
traits is false?
an affected man can pass on the trait to his son
which of the following cannot occur with x-linked dominant
inheritance for a rare trait?
1/2
