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Which is true about a testcross?
A.) It is mating between two hybrid individuals
B.) It is mating between a hybrid individual
and a homozygous recessive individual
C.) It is a mating between a homozygous
dominant individual and a homozygous
recessive individual
D.) It is mating to determine which
individual is homozygous recessive
E.) It is a mating between an individual of
unknown genotype and a homozygous
recessive individual
E. It is a mating between an
individual of unknown
genotype and a homozygous
recessive individual
All are true of crossover EXCEPT:
A. It normally occurs between sister
chromatids
B. It is the site of chiasma
C. It is responsible for linked genes
being inherited separately
D. It cannot occur between sex
chromosomes in human males
E. It is a common event
A. It normally
occurs between
sister chromatids
A round watermelon is crossed with a
long watermelon and all the offspring
are oval. If two oval watermelons are
crossed, what is the percent of
watermelons that will be round?
A. 0
B. 25%
C. 50%
D. 75%
E. 100%
B. 25%
In peas, the trait for tall plants is dominant (T)
and the trait for short plants is recessive (t). The
trait for yellow seeds is dominant (Y) and the trait
for green seeds is recessive (y). A cross between
two plants results in 292 tall yellow plants and 103
short green plants. Which of the following are
most likely to be the genotypes of the parents?
A. TtYY x Ttyy
B. TTYy xTTYy
C. TTyy x TTYy
D. TtYy x TtYy
E. TtYy x TTYy
D. TtYy x TtYy
A child is born with blood type O. All
of the following could the blood type
of the parents EXCEPT
A.A and B
B. A and A
C. O and O
D. AB and O
E. A and O
D. AB and O
ABCDEF -> ABEDCF
A rearrangement in the linear sequence
of genes as shown in the diagram above
is known as a/an
A. Translocation
B. Deletion
C. Addition
D. Polyploidy
E. Inversion
E. Inversion
The expression of both alleles for a
trait in a hybrid individual is
A. Pleiotropy
B. Epistasis
C. Codominance
D. Complementation
E. Incomplete Dominance
C. Codominance
How many autosomes does the human
male normally have?
A. 1
B. 2
C. 22
D. 23
E. 44
E. 44
Assume that two genes, A and B, are not
linked. If the probability of allele A being in
a gamete is ½ and the probability of allele B
being in a gamete is 1/2 , then the probability
of BOTH A and B being in the same gamete
is
A. 1/2
B. 1/4
C. 1
D. 1/8
E. 0.5
B. 1/4
In one strain of mice, fur color ranges from
white to darkest brown with every shade of
brown in between. This pattern of
inheritance for fur color is probably
controlled by
A. Multiple genes
B. A single gene with many alleles
C. Pleiotropy
D. One gene with hundreds of incidences of
crossover
E. incomplete dominance
A. Multiple Genes
Two traits, A and B, are linked, but they are
not always inherited together. The most
likely reason is
A. they are not really on the same
chromosome
B. they are not sex-linked
C. they are on the same chromosome but are
far apart
D. they are close together on the same
chromosome
E. none of the above is correct
C. They are on the
same chromosome
but are far apart
A man who has a sex-linked allele will
pass it on
A. All of his daughters
B. All of sons
C. ½ of his daughters
D. ½ of sons
E. all of his children
A. All of his
daughters
In garden peas, tall is dominant to short. If
you crossed tall plants to short plants and
found that half of the offspring were tall
and half were short, what would you
expect the genotypes of the parents to
have been?
A. TT x TT
B. TT x Tt
C. Tt x Tt
D. Tt x tt
E. tt x tt
D. Tt x tt
Assume that a human couple has five
daughters. What is the probability that
their fifth child will also be a girl?
A. 0%
B. 25%
C. 50%
D. 75%
E. 100%
C. 50%
Which of the following is true of alleles found
on the X chromosome?
A. There aren’t alleles on the X chromosome
B. They are inherited unequally in males
and females
C. They are inherited the same way
autosomal dominants are inherited
D. They are inherited equally in males and
females
E. They are inherited only in females
B. They are
inherited unequally
in males and
females
How many chromosomes will be in a
somatic cell of an animal with a single
trisomy if n=14?
A. 14
B. 28
C. 29
D. 46
E. Can’t tell from the data
C. 29
How many chromosomes will be in a
triploid cell if an animal is n=14?
A. 14
B. 28
C. 23
D. 42
E. 46
D. 42
Which of the following is a picture of
the chromosomes in a cell?
A. Autosome
B. Amniocentesis
C. Chorionic Villus Sample
D. Karyotype
E. Pedigree
D. Karyotype
Which of the following human genetic
disease is X-linked?
A. Hemophilia
B. Down Syndrome
C. Fragile X Syndrome
D. Klinefelter Syndrome
E. Turners syndrome
A. Hemophilia
Which of the following causes a
trisomy?
A.Duplication
B. Inversion
C. Linkage
D. Nondisjunction
E. Translocation
D. Nondisjunction
Which type of disease is responsible for a
cross involving the following genotypes
AA x aa resulting in an individual with a
genetic disease.
A. Autosomal dominant
B. Autosomal recessive
C. Incomplete Dominance
D. Complete Dominance
E. Multiple Alleles
F. Polygenic Inheritance
A. Autosomal
Dominant
The parents both have the genotype Aa. The
probability is that 25% of their offspring will
have a genetic disease.
What type of disease is this?
A. Autosomal dominant
B. Autosomal recessive
C. Incomplete Dominance
D. Complete Dominance
E. Multiple Alleles
F. Polygenic Inheritance
B. Autosomal
Recessive
Human height and eye color represent this
pattern of inheritance.
A. Autosomal dominant
B. Autosomal recessive
C. Incomplete Dominance
D. Complete Dominance
E. Multiple Alleles
F. Polygenic Inheritance
F. Polygenic
Inheritance
The offspring of the Tt x Tt will show a
1:2:1 phenotypic ratio.
A. Autosomal dominant
B. Autosomal recessive
C. Incomplete Dominance
D. Complete Dominance
E. Multiple Alleles
F. Polygenic Inheritance
C. Incomplete
Dominance
Human blood type illustrates this pattern
of inheritance.
A. Autosomal dominant
B. Autosomal recessive
C. Incomplete Dominance
D. Complete Dominance
E. Multiple Alleles
F. Polygenic Inheritance
E. Multiple Alleles
Make your wager
Final Answer
Final Question