Leader: Kirsten Karkow
Course: Biol 211 - Wilsey
Date: 4/3/2012
Practice Exam 4
Supplemental Instruction
Iowa State University
1. Which of the following characteristics display quantitative inheritance?
a. Height
b. Hair Color
c. Number of fingers
d. A and C
e. B and A
2. Eye color is a gene on the X chromosome in flies, with red dominant to white. If a whiteeyed female mates with a red-eyed male, what is the chance that their first son will
have white eyes?
a. 0%
b. 25%
c. 50%
d. 75%
e. 100%
3. An inactivated X chromosome is known as …
a. Heterochromatin
b. A barr body
c. A deletion
d. A null chromosome
4. The chromosome mutation in which segments are exchanged between non-homologous
chromosomes is known as…
a. Reciprocal translocation
b. Inversion
c. Crossing over
d. Non-disjunction
5. Mitochondria and chloroplasts are inherited through…
a. Cytoplasmic inheritance from the mother and father cells
b. Inheritance of nuclear DNA
c. Maternal inheritance
d. Extracellular processes
6. What is microevolution?
a. The formation of new species over time
b. Changes in the gene frequencies of a population over time
c. The isolation of species
d. Enhanced survival and reproduction in individuals
Supplemental Instruction
1060 Hixson-Lied Student Success Center  294-6624  www.si.iastate.edu
7. Fitness refers to…
a. Ability to survive
b. Physical ability
c. Ability to reproduce
d. A and C
e. A and B
8. ________________ proposed the inheritance of acquired characteristics.
a. Lyell
b. Lamarck
c. Linnaeus
d. Malthus
9. What did Darwin “discover”?
a. Evolution
b. Heredity
c. Natural selection
d. Acquired characteristics
10. Which of the following is NOT a point in Darwin’s concept of natural selection?
a. There is variation among individuals in a population.
b. The number of individuals that survive is small relative to the number of
offspring they produce.
c. Many offspring do not survive.
d. Individuals that acquire characteristics that best match the environment leave
more offspring.
11. Homologous structures…
a. Share a common ancestral form
b. Have a similar function
c. Are reduced from their ancestral form
d. A and B
e. B and C
12. Evolution occurs at the ________ level. Natural selection occurs at the ________ level.
a. Population; population
b. Individual; species
c. Population; individual
d. Species; population
13. Which of the following best describes a gene pool?
a. All of the alleles of all of the individuals in a species.
b. All of the alleles of a specific gene in a species.
c. All of the alleles in a population.
d. The different types of available alleles in a group of organisms.
14. Which of the following isn’t an assumption of the Hardy-Weinberg model?
a. Very large population
b. No gene flow
c. No changes in allele frequencies
d. No disease
e. B and D
15. PKU is an autosomal recessive disorder. If 4% of a population of 1000 people have this
disease, how many individuals will be carriers for this disorder?
a. 160
b. 320
c. 360
d. 640
16. In unicorns, BB results in blue manes, bb in pink manes, and the heterozygote in purple
manes. If there are 360 blue-maned unicorns in a non-evolving population of 1000, how
many pink-maned and purple-maned unicorns are there?
a. 400 pink-maned, 240 purple-maned
b. 160 pink-maned, 240 purple-maned
c. 360 pink-maned, 280 purple-maned
d. 160 pink-maned, 480 purple-maned
17. Which of the following gives an example of the bottleneck effect?
a. Man hunting woolly mammoths to extinction
b. A scientist brings 10 blue macaws to a new island
c. A tsunami wipes out almost all the coconut trees on Aruba
d. All of the above
e. Both B and C
18. Which of the following is an adaptive process?
a. Genetic drift
b. Natural selection
c. Mutation
d. Migration
e. B and D
19. Which type of selection can lead to the splitting of a single species?
a. Diversifying selection
b. Directional selection
c. Stabilizing seection
d. Disruptive selection
e. A and D
f. A, B and D
20. Evolution is limited in that…
a. It always takes a long time to create a new species
b. It only acts on plants and animals
c. It is a random process
d. It can only act on alleles that create phenotypes
21. A species can be defined as…
a. Individuals that are capable of successful reproduction
b. Individuals that look the same
c. Indivudals that are adapted to the same environment
d. All of the above
22. The finches Darwin studied evolved from a common ancestral species through the
exploitation of different resources within the same environment. This is an example of…
a. Sympatric speciation
b. Temporal isolation
c. Allopatric speciation
d. Gametic isolation
23. Which of the following is not a prezygotic barrier?
a. Displaying different mating behaviors
b. Hybrid inviability
c. Mechanical isolation
d. Having noncompatible gametes
24. The amphibian species Rana aurora breeds January-March. Rana boylii breeds MarchMay. These two species display…
a. Habitat isolation
b. Behavioral isolation
c. Temporal isolation
d. Gametic isolation
25. Plants of two different species are mated, and their offspring function as normal. These
offspring are then self-fertilized, and the resulting F2 generation barely grows. This is an
example of…
a. Hybrid sterility
b. Hybrid inviability
c. Hybrid breakdown
d. Hybrid vigor