Download Exam 5 Review - Iowa State University

Worksheet:
Exam 5 Review
Supplemental Instruction
Iowa State University
Leader:
Course:
Instructor:
Date:
Kelly
Biol 211 (3)
Biederman
4/5/16
1). Which of the following statements is false about genetic drift?
a) Genetic drift is one cause of microevolution
b) Genetic drift is the random change in allele frequencies in a population
c) Genetic drift has a stronger affect on really small populations
d) Genetic drift can predict allelic frequencies of each generation
e) All statements are false
2). __________ isolation is an example of a prezygotic barrier where two species of trout
breed at different seasons.
a) Gametic
b) Temporal
c) Behavioral
d) Habitat
e) Mechanical
3.) Individuals from two lizard species can mate but the offspring are sterile. This is an example of a
A) pre-zygotic reproductive barrier
B) anatomical incompatibility
C) geographic isolation
4.) The formation of a land bridge between North and South America about three million years
ago should have resulted in which of the following?
I. allopatry of marine populations that were previously sympatric
II. sympatry of marine populations that were previously allopatric
III. sympatry of terrestrial populations that were previously allopatric
a) I
b) II
c) III
d) I, II
e) I, III
5.) In the Hardy-Weinberg equation, 2pq refers to the frequency
A) of individual that are homozygous for one of the alleles
B) of individual that are heterozygous
C) of all the alleles in the population
D) of all the genotypes in the population
6.) Which type of species concept would you NOT use to determine if a newly discovered population of
an asexually reproducing plant was a distinct species?
A) Biological Species Concept
B) Morphological Species Concept
C) Ecological Species Concept
D) Genetic Species Concept
E) Physiological Species Concept
1060 Hixson-Lied Student Success Center  515-294-6624  [email protected]  http://www.si.iastate.edu
Evolution: Define it in less than 10 words.
Darwin's Theory:
Explain the two components of Darwin’s Theory.
Idea 1:
Idea 2:
What evidence supports idea 1?
What is necessary for idea 2 to occur?
How does artificial selection differ?
Evolution acts on_________________.
Natural Selection Acts on____________________.
Microevolution: Hardy-Weinberg (Measuring Evolution):
What is a population? What is a gene pool?

What equations are helpful for measurement? What does each variable stand for?

What are the conditions for Hardy Weinberg?
-How do we know when evolution is occurring? Why is this equation useful?
-What type of population is most likely to be in Hardy Weinberg Equilibrium?
Problem: If 48 out of one hundred individuals are homozygous dominant (AA). What is q?
Causes of Evolution: Explain BRIEFLY. Which are the most important? Which occur by chance?
1. Genetic Drift
2. Natural Selection (Draw the graph!)
Founder Effect-
Directional Selection-
Disruptive SelectionBottleneck Effect-
Stabilizing Selection-
Macroevolution:
Speciation: What are the 3 steps?
Step 1:
Step 2:
Step 3:
How do allopatric and sympatric speciation differ?
Defining a species:
What is the biological species concept?
What are some advantages and disadvantages to this concept?
Pre-zygotic barriers
Post-zygotic barriers
What is the primary difference between these two categories?
3. Migration
4. Mutation
Things to consider in Wednesday’s lecture.
What is Cladogenesis?
What is an adaptation? How is this related to Natural Selection?
Examples to Identify:
1. Amish people of Lancaster County, Pennsylvania. They are descended from a few dozen individuals
belonging to an Anabaptist sect in Germany who migrated to Pennsylvania during the early 1700's. Over
the last 40 years of the 20th century, 61 babies with an extremely rare fatal genetic disorder known as
microcephaly were born to 23 Amish families.
2. two populations of flies exist in the same geographical area, but one group lives in the soil and another
lives on the surface of the water.
3. Bush babies, a group of small arboreal primates, are divided into several species. Each species has
distinctly shaped genitalia that, like locks and keys, only fit with the genitalia of its own species.
4. In 1775, a typhoon killed at least 90% of its people, thereby eliminating most of the genetic
variation. One of the 20 survivors was a man named Nahnmwarki Mwanenised. He had achromatopsia,
a very rare genetically inherited recessive eye condition that causes total color blindness and extreme
sensitivity to light. Six generations later, nearly 5% of the island's population had achromatopsia.
5. A plant that is too short may not be able to compete with other plants for sunlight. However, extremely
tall plants may be more susceptible to wind damage
6. South and Central American Indians were nearly 100% type O for the ABO blood system and 100%
positive for the Rh blood system. Since nothing in nature seems to strongly select for or against blood
types, it is likely that most of these people are descended from a small band of closely related "founders"
who also shared these traits.
7. Two mammals of different species produce offspring that are infertile.
8. Some species of crickets are morphologically identical, but can be distinguished by the fact that
females will only respond to the mating songs of males of their own species. Males of other species are
ignored.
9. A plant of extremely variable height that is pollinated by three different pollinators, one that was
attracted to short plants, another that preferred plants of medium height and a third that visited only the
tallest plants. If the pollinator that preferred plants of medium height disappeared from an area.
10. Sea urchins, for example, release their gametes into the water column. In reproductively isolated
species, male and female gametes actually meet, but the sperm does not fertilize the egg.
11. In crosses between different species of irises, for example, the embryos die before seeds form.
12. Outbreeding perennials which have been hybridised to produce garden cultivars, such as Iris and
Watsonia, F2 plants are weaker than their F1 parents but are not sterile.
1060 Hixson-Lied Student Success Center  515-294-6624  [email protected]  http://www.si.iastate.edu