Name: ___________________________________
Chapter 6 and 7 Test topics (practice problems provided on back)
This list is not necessarily all inclusive. You should study your entire note packet, all
worksheets, and all examples/practice work done in class and/or for homework
6.3 - 6.5
1. Who is Gregor Mendel? What is he known for?
2. Why did Mendel work with purebred plants?
3. Understand the difference between phenotype and genotype.
4. What is Mendel's First Law? explain.
5. What is Mendel's Second Law? explain.
6. When are dominant alleles expressed?
7. When are recessive alleles expressed?
8. Be familiar with all of the vocabulary (gene, heterozygous, homozygous, dominant,
recessive, allele, trait etc)
9. Be able to complete a punnett square and work problems like the examples in your
notes and on the back of your test topics.
10.What is meant by P generation? F1? F2?
11.What is a test cross? Know how to (and when to) perform a testcross
12.How are genes and alleles related? How are these terms related to homologous
chromosomes?
13.What is a dihybrid cross? Be able to answer questions about a dihybrid cross. Use the
math trick!
7.1
1. Describe what it means to be a "carrier" of a certain gene
2. How do disorders caused by dominant alleles and disorders caused by recessive alleles
differ? give examples. (autosomal dominant vs autosomal recessive) Be able to
complete punnett squares based on this.
3. What kind of disorder is Huntington's disease? Why is it especially devastating (in
terms of inheritance) Draw punnett squares to support your answer
4. How do males and females differ in sex-linked traits? Draw punnett squares to support
your answer (x-linked recessive disorders like hemophilia and color blindness)
5. How do sex-linked genes differ from genes carried on our autosomes?
6. What is X chromosome inactivation and why does it occur?
7. Describe X-inactivation by explaining the colorings of Calico cats.
8. How are the X and Y chromosomes different?
7.2-7.4
1. Understand and be able to provide examples of codominance (use blood typing as your
example). Be able to complete Punnett squares for codominant traits
2. Understand and be able to provide examples of incomplete dominance. Be able to
complete Punnett squares for incompletely dominant traits
3. Describe and give examples of polygenic traits
4. What is a linkage map? be able to draw a linkage map
5. What is a karyotype?
6. Be able to fill in genotypes on a pedigree when given mode of inheritance
Name: ___________________________________
Practice Problems
1. Sickle cell anemia is an autosomal recessive disorder. Cross a homozygous recessive parent with a
heterozygous parent. What are the chances a child from these parents would have sickle cell?
2. Marfan syndrome is an autosomal dominant disorder. Cross a homozygous dominant parent with a
homozygous recessive parent. What are the chances a child from these parents would have Marfan
syndrome?
3. Duchenne muscular dystrophy is a sex-linked recessive disorder. Cross a carrier mother with a
normal father. What are the chances a female child from these parents would have Duchenne
muscular dystrophy? Male?
4. Hunter’s syndrome Is a sex-linked recessive disorder. Cross a homozygous recessive mother with a
normal father. What are the chances a female child from these parents would have Hunter’s
syndrome? Male?
5. Rett syndrome is a sex-linked dominant disorder. Cross a heterozygous mother with a father
carrying the dominant allele. What are the chances a female child from these parents would have
Rett syndrome? Male?
6. If hair texture in humans shows incomplete dominance. What phenotype(s) would the offspring
exhibit if a curly haired individual is crossed with a straight haired individual?
7. If feather color in birds exhibits codominance. What phenotype(s) would the offspring exhibit if a
blue bird was crossed with a red bird?
For questions 8-10, answer the following questions:
A.
B.
C.
D.
What is the probability that the offspring will show the dominant phenotype for both traits?
What is the probability that the offspring will show the recessive phenotype for both traits?
What is the probability that the offspring will have a heterozygous genotype for both traits?
What s the probability that the offspring will have a homozygous dominant genotype for both
traits?
E. What is the probability that the offspring will show the dominant phenotype for the first trait
listed, but recessive phenotype for the other?
F. What is the probability that the offspring will show a homozygous recessive genotype for the
first trait listed and heterozygous genotype for the other?
8. RrTt x RrTt
9. GGHH x gghh
10. PpYy x ppyy