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Final Exam Review
Test Description: Review for final exam genetics
Instructions: Answer all questions to get your test result.
1) Which scenario breaks the law of segregation?
A
a gamete contains the father’s allele
B
the gamete fertilized has the dominant trait
C
a gamete produced has 2 of the same alleles after meiosis II
D
the gametes produced each have 1 allele after meiosis II
2) Some flowering plants appear to have offspring that have traits that are intermediate between those of the parents. Which type of dominance is exhibited by the offspring?
A
codominance
B
incomplete dominance
C
complete dominance
D
blended dominance
3) Which blood type could be given as a transfusion for patient with AB blood when the RH factor is unknown?
A
AB+
B
AB–
C
O+
D
A+
4) Mendel’s pea plants had either purple or white flowers. This means that the plants
A
have two alleles for the gene.
B
have two recessive traits.
C
can self-pollinate.
D
have two copies of a gene from one parent.
5) If Mendel had crossed a true breeding dominant plant with a true breeding recessive plant, in which of the three generations is the recessive trait visible?
A
P generation and F2 generation
B
F1 generation and F2 generation
C
P generation only
D
F1 generation only
6) two birds are crossed; one that is homozygous for red feathers and one that is homozygous for blue feathers. Purple offspring result due to incomplete dominance. Then, two of the purple offspring are crossed. how many of the offspring will be purple?
A
3 in 4
B
1 in 4
C
4 in 4
D
2 in 4
7) In roses, red flowers and long stems are dominant. A rose that is homozygous for both red flowers and long stems is crossed with one that is heterozygous for red flowers and homozygous for short stems. How many offspring will have red, long stems?
A
75 percent
B
50 percent
C
100 percent
D
25 percent
8) Parents with the genotypes AO and AB have a child. What are all the possible blood types of the child?
A
O, AB
B
O, AB, A
C
A, B
D
A, AB, B
9) A plant that has round and yellow seeds (RrYy) is crossed with a plant that has round and yellow seeds (RrYy). What is the ratio of the offspring that will have round and yellow seeds? Key: R = round r = wrinkled Y = yellow y=green
A
8:16
B
9:16
C
1:16
D
3:16
10) What does the notation TT mean to geneticists?
A
one dominant and one recessive allelle
B
at least one dominant allele
C
two dominant alleles
D
two recessive alleles
11) Factors that control traits are called
A
purebreds
B
genes
C
recessives
D
parents
12) Scientists call an organism that has two different alleles for a trait a
A
factor
B
hybrid
C
trait
D
purebred
13) What does a Punnett square show?
A
only the recessive alleles in a genetic cross
B
all of Mendel’s discoveries about genetic crosses
C
only the dominant alleles in a genetic cross
D
all the possible outcomes of a genetic cross
14) If a homozygous black guinea pig (BB) is crossed with a homozygous white guinea pig (bb), what is the probability that an offspring will have black fur?
A
75 percent
B
50 percent
C
25 percent
D
100 percent
15) An organism’s physical appearance is its
A
phenotype
B
heterozygous
C
codominance
D
genotype
16) What does codominance mean in genetics?
A
Both alleles are recessive.
B
Both alleles are dominant.
C
Each allele is both dominant and recessive.
D
The alleles are neither dominant nor recessive.
17) What happens during meiosis?
A
Chromosome pairs remain together when new sex cells are formed.
B
Each sex cell copies itself to form four new chromosomes.
C
Each sex cell loses all of its chromosomes.
D
Chromosome pairs separate to form new sex cells.
18) When sex cells combine to produce offspring, each sex cell will contribute
A
twice the normal number of chromosomes.
B
one fourth of the normal number of chromosomes.
C
half the normal number of chromosomes.
D
the normal number of chromosomes.
19) What is a mutation?
A
any change that is helpful to an organism
B
any change in the phenotype of a cell
C
any change in a gene or chromosome
D
any change that is harmful to an organism
20) The different forms of a gene are called
A
traits
B
alleles
C
factors
D
masks
*select an answer for all questions
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