Genetics Test
by Brooke Passmore
| 28 Questions
4 pts
If both parents are homozygous dominant for brown eyes. What is the probabitility of them having a child with blue eyes?
a. 0%
b. 25%
c. 50%
d. 75%
e. 100%
4 pts
What did Gregor Mendel do to study different characteristics in his genetics experiments?
a. He studied only asexual plants.
b. He studied only tall and short pea plants.
c. He cross-pollinated plants.
d. He cross-pollinated both plants and animals.
4 pts
Factors that control traits are called
a. genes.
b. purebreds.
c. recessives.
d. parents.
4 pts
Scientists call an organism that has two different alleles for a trait a
a. hybrid.
b. trait.
c. purebred.
d. factor.
4 pts
An organism’s physical appearance is its
a. genotype
b. phenotype
c. codominance
d. heterzygous
4 pts
Scientists call an organism that has two different alleles for a trait a
a. homozygous alleles
b. two dominant alleles
c. one dominant and one recessive allele
d. two recessive alleles
4 pts
What is probability?
a. the actual results from a series of events
b. the number of times a coin lands heads up
c. the way the results of one event affect the next event
d. a number that describes how likely it is that an event will occur
4 pts
What is the probability of producing a tall pea plant from a genetic cross between two hybrid tall pea plants?
a. one out of four
b. two out of four
c. three out of four
d. four out of four
3 pts
An organism’s genotype is its
a. height
b. genetic makeup
c. probability
d. physical appearance
3 pts
An organism that has two identical alleles for a trait is
a. homozygous
b. codominant
c. heterzygous
d. incomplete
3 pts
What does a Punnett square show?
a. all the possible outcomes of a genetic cross
b. only the dominant alleles in a genetic cross
c. only the recessive alleles in a genetic cross
d. all of Mendel’s discoveries about genetic crosses
3 pts
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. 25%
b. 50%
c. 75%
d. 100%
3 pts
A heterozygous organism has
a. three different alleles for a trait.
b. two identical alleles for a trait.
c. only one allele for a trait.
d. two different alleles for a trait.
3 pts
The passing of traits from parent to offspring is called
a. dominant
b. hybrid
c. probability
d. heredity
3 pts
An offspring will receive how many alleles from each parent to determine a specific trait?
a. one
b. three
c. four
d. two
3 pts
A dog gives birth to 5 puppies. What percentage of the chromosomes does each puppy share with the mother?
a. 100%
b. 75%
c. 50%
d. 25%
3 pts
Which of the following genotypes is a purebred?
a. Gg
b. SS
c. Bb
d. Tc
3 pts
Scientist, farmers, and ranchers breed the organisms that have the genes they are wanting. Which process are they using?
a. natural selection
b. cellular respiration
c. artificial selection "selective breeding"
d. homeostasis
3 pts
All of the following statements are reasons for selective breeding except:
a. To produce offspring with desirable characteristics
b. To increase migration patterns
c. To improve the quality of food
d. Farmers increase their profit by improving crops
3 pts
Which of the following are benefits of gene modification?
a. Resistance to pesticides
b. Resistance to drought
c. Resistance to disease
d. All answers are correct
3 pts
Natural Selection = Nature made Artificial Selection = Man made
4 pts
With asexual reproduction, the offspring are not identical to the parents.
3 pts
Recessive alleles are represented by a capital letter.
4 pts
A hybrid is the offspring of parents that have different alleles for a trait.
5 pts
In pea plants, green pod color is controlled by a dominant allele. Yellow is controlled by a recessive allele. Explain why a plant with yellow pods can never be a hybrid.
3 pts
Artificial selection has many uses in the agriculture world. What are some concerns about using artificial selection with humans? Is it always ok to use with plants and animals?
5 pts
In pea plants, the allele for smooth pods (S) is dominant over the allele for pinched pods (s). Construct a Punnett square that shows a cross between an SS plant and an Ss plant. Predict what percent of the offspring are likely to have smooth pods.
5 pts
Use the punnett square above. What is the missing genotype?
a. TT
c. tt

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