Foundations of Science
Genetics Quiz 3
Name_____________________
Date____________ Period____
Part 1: Vocabulary (8 points)
Directions: Match the word with the correct definition.
1. Genotype______
2. Heterozygous _____
3. Malaria _____
4. Sickle Cell Anemia ____
5. Dominant _____
6. Phenotype ____
7. Homozygous ____
8. Mutation ____
1. A genetic disorder where some red
blood cells cannot carry oxygen
2. A change in an organism’s DNA.
3. An organism’s outward appearance
4. An organism’s genetic makeup
5. A diseased caused by a parasite that
kills over 1 million people yearly
6. The allele that is fully expressed in a
heterozygous pair
7. Having 2 different alleles for a trait
8. Pair of identical alleles for a trait
Part 2. Huntington’s disease (24 points)
Huntington’s disease is a genetic disorder that is caused by a defective DOMINANT
gene. If a person has 1 or 2 dominant genes, they have the disorder. If a person has 2
recessive genes, they are normal.
9. What letters will be used for the genotypes of Huntington’s disease?
a. Huntington’s: ____
b. Normal: ____
10. What genotype does someone have if they are homozygous for Huntington’s
disease? ____
11. What genotype does someone have if they are heterozygous for Huntington’s
disease? ____
12. What genotype does someone have if they are homozygous normal? ____
Foundations of Science
Genetics Quiz 3
Name_____________________
Date____________ Period____
Complete the following Punnett Square:
13. A mother who is homozygous for Huntington’s disease and a father who is
homozygous normal want to have a baby. What genotypes and phenotypes are
possible for their child?
Mom ____ x Dad ____
Dad
Mom
Write all of the genotypes and phenotypes from the above Punnett Square in the
space below.
Genotypes:
Phenotypes:
Fraction:
Percent:
_________
_________
________
________
14. Suppose this woman (homozygous for Huntington’s disease) emigrated from
Europe to South America and had 12 children. (Keep in mind that if a disorder is
rare, most people in the population would have the genotype for homozygous
normal, which is what we used in the above Punnett Square.)
What genotype do all of her children have? _____)
15. A mother who is heterozygous for Huntington’s disease (child from mother in #8)
and a father who is homozygous normal want to have a baby. What genotypes
and phenotypes are possible for their child?
Mom ____ x Dad ____
Dad
Mom
Write all of the genotypes and phenotypes from the above Punnett Square in the
space below.
Genotypes:
Phenotypes:
Fraction:
Percent:
_________
_________
________
________
_________
_________
________
________
Foundations of Science
Genetics Quiz 3
Name_____________________
Date____________ Period____
16. A mother who is heterozygous for Huntington’s disease and a father who is
heterozygous for Huntington’s disease want to have a baby. What genotypes and
phenotypes are possible for their child?
Mom ____ x Dad ____
Dad
Mom
Write all of the genotypes and phenotypes from the above Punnett Square in the
space below.
Genotypes:
Phenotypes:
Fraction:
Percent:
_________
_________
________
________
_________
_________
________
________
_________
_________
________
________
Part 3. Cystic Fibrosis (20 points)
Cystic fibrosis is a genetic disorder that is caused by a defective RECESSIVE gene. If a
person has 1 or 2 dominant genes, they are normal. If a person has 2 recessive genes,
they have the disease.
17. What letters will be used for the genotypes of Cystic Fibrosis?
c. Normal: ____
d. Cystic Fibrosis: ____
18. What genotype does someone have if they are homozygous normal?____
19. What genotype does someone have if they are heterozygous normal? ____
20. What genotype does someone have if they are homozygous for Cystic Fibrosis?
____
Foundations of Science
Genetics Quiz 3
Name_____________________
Date____________ Period____
Complete the following Punnett Square:
21. A mother who is homozygous normal and a father who has Cystic Fibrosis want
to have a baby. What genotypes and phenotypes are possible for their child?
Mom ____ x Dad ____
Dad
Mom
Write all of the genotypes and phenotypes from the above Punnett Square in the
space below.
Genotypes:
Phenotypes:
Fraction:
Percent:
_________
_________
________
________
22. A mother who is heterozygous normal and a father who has Cystic Fibrosis want
to have a baby. What genotypes and phenotypes are possible for their child?
Mom ____ x Dad ____
Dad
Mom
Write all of the genotypes and phenotypes from the above Punnett Square in the
space below.
Genotypes:
Phenotypes:
Fraction:
Percent:
_________
_________
________
________
_________
_________
________
________
Foundations of Science
Genetics Quiz 3
Name_____________________
Date____________ Period____
23. A mother who is heterozygous normal and a father who is heterozygous normal
want to have a baby. What genotypes and phenotypes are possible for their child?
Mom ____ x Dad ____
Dad
Mom
Write all of the genotypes and phenotypes from the above Punnett Square in the
space below.
Genotypes:
Phenotypes:
Fraction:
Percent:
_________
_________
________
________
_________
_________
________
________
_________
_________
________
________
Extra Credit Part 1. Huntington’s Disease and Cystic Fibrosis Analysis(4 points)
24. What genotypes can a person who has Huntington’s disease have?
__________________________________________________________________
__________________________________________________________________
________________________
25. What genotypes can a person who has Cystic Fibrosis have?
__________________________________________________________________
26. Why do you think someone who is heterozygous normal is often called a Carrier
for a genetic disorder?
__________________________________________________________________
__________________________________________________________________
________________________
27. Is it possible for 2 carriers (both normal) to have a child with the disorder? Why
or why not?
__________________________________________________________________
__________________________________________________________________
____________
Foundations of Science
Genetics Quiz 3
Name_____________________
Date____________ Period____
Extra Credit Part 2: Biodiversity and Global Warming (4 points)
Base your answers to question 28 on the passage below and your knowledge of
biodiversity.
Human activities have had a major impact on biodiversity. Scientists
cannot solve this problem alone. People that care about the
environment need to be involved in restoring and maintaining
biodiversity.
28. Explain how a loss of biodiversity today can affect the survival of humans in the
future. [1]
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________________________________________________________________________
________________________________________________________________________
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________________________________________________________________________
29. Some scientists are urging that immediate action be taken to stop activities that
contribute to global warming. Discuss the effects of global warming on the environment
and describe some human activities that may contribute to it. Your answer MUST
include:



an explanation of what is meant by the term GLOBAL WARMING. [1]
one human activity that is thought to be a major contributor to global warming
and an explanation of how it may contribute to the problem. [1]
one negative effect of global warming if it continues for many years. [1]
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