Download Concept Checks for Genetics Unit

Concept Checks for CH 10 and 12
Sections 10.1-10.5 & 12.2-12.4
10.1
1. Explain how Mendel’s particulate hypothesis is different from the blending hypothesis of
inheritance.
2. What is the difference between self-fertilization and cross-fertilization?
3. Describe a pattern of inheritance that the blending hypothesis fails to explain.
10.2
1.What are the two possible gametes produced by the plant that has the genotype Aa? Give the
probability of each type of gamete.
2.Use a Punnett square to predict the genotypes produced if the plant in question #1 is self-fertilized.
Calculate the probability of each outcome.
3.List all the possible genotypes of a pea plant with purple flowers and round seeds.
4.List the four possible allele combinations in the gametes of a plant with genotype PpWw.
10.3
1.For a trait with an intermediate inheritance, what is the phenotypic ratio for F2 offspring of the
monohybrid cross? How is that different from a simple dominant-recessive cross?
2.Two parents have type O blood. What blood type would you expect for their first child?
3.What is the likely mechanism of inheritance for a character with a large range of phenotypes?
Explain.
4. Give three examples of human physical characters affected by environment.
10.4
1.Draw a picture of the possible arrangements of chromosomes in the gametes produced by a pea
plant with genotype RRYy. Label the gene loci. (Remember that these genes are located on separate
chromosomes)
2.Explain how the distance between two gene loci on the same chromosome affect gene linkage.
10.5
1.Describe why one would expect to find more white-eyed male fruit flies than white-eyed females in
natural populations.
2.A man with hemophilia and a homozygous non-hemophiliac woman have a son. Is it possible for
the son will inherit hemophilia? Why or why not?
12.2
1. What is the relationship between trisomy 21 and Down’s syndrome? Describe how nondisjunction
can result in trisomy 21.
2. List and define the four types of damage to chromosome structure than can cause disorders.
3. What is a “jumping gene,” or transposon?
4. How is the mother’s age related to the probability of non separation of chromosomes in her
gametes?
12.3
1. What information is collected to create a pedigree for a particular trait?
2. Give an example of a recessive disorder, dominant disorder, and a sex-linked recessive disorder.
Describe how each is inherited.
3. What does a genetic counselor do?