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Genetics
Test Description: Genetics review for the final.
Instructions: Answer all questions to get your test result.
1) Hemophilia is caused by a(n)
A
recessive allele on the X chromosome.
B
dominant allele.
C
change in diet.
D
extra chromosome.
2) Genetic disorders are caused by
A
recessive alleles only.
B
dominant alleles only.
C
DNA mutations or changes in chromosomes.
D
pedigrees.
3) 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
4) What is the purpose of the Human Genome Project?
A
to clone every gene on a single chromosome in human DNA
B
to cure genetic diseases
C
to identify the DNA sequence of every gene in the human genome
D
none of the above
5) Why are sex-linked traits more common in males than females?
A
All genes are recessive.
B
A recessive allele on the X chromosome will always produce the trait in a male.
C
All alleles on the Y chromosome are recessive.
D
Any allele on the Y chromosome will be dominant with the matching allele on the X chromosome.
6) What must occur for a girl to be colorblind?
A
None of the above.
B
Each parent must be colorblind.
C
Each parent must have the recessive allele for colorblindness.
D
Each parent must have two codominant alleles for colorblindness.
7) An organism’s genotype is its
A
physical appearance.
B
stem height.
C
combination of genetic makeup and physical appearance.
D
genetic makeup.
8) Scientists call an organism that has two different alleles for a trait a
A
genotype.
B
factor.
C
trait.
D
hybrid.
9) Which of these is an example of the benefits of genetic engineering?
A
cross-breeding to create disease-resistant crops
B
none of the above
C
creating human insulin to treat people with diabetes
D
analyzing karyotypes and pedigree charts
10) What is copied during replication?
A
the cell’s DNA
B
the nucleus
C
chromosomes
D
the cell’s organelles
*select an answer for all questions
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