SI 11-6-6 Practice Exam III
Bio 211-5 Part II
Multiple Choice:
1. Males have the sex chromosomes __ and __ while females have __ and __.
a. XX, XY
b. XY, XX
c. YY, XY
d. XY, YY
2. Mutations introduce ______into a population.
a. natural selection
b. new species
c. programmed cell death
d. genetic variation
3. What does it mean to be a “carrier” of a gene?
a. the organism is heterozygous and “carries” the recessive gene but it is not
expressed in the phenotype.
b. the organism is homozygous recessive and the recessive gene is expressed in
the phenotype.
c. the gene is hidden on a different chromosome due to translocation
d. there are more than two copies of the gene in the organism so it is said to be
“carrying” an extra copy.
4. For crossing over to have a significant effect, it has to take place between ______.
a. sister chromatids of the same chromosome
b. non-sister chromatids of homologous chromosomes
c. sex chromosomes, one X and one Y
d. exact copies of the same chromosome
5. A 3:1 phenotypic ratio results from a _____ cross and a 9:3:3:1 ratio results from a ______cross.
a. F1, F2
b. hybrid, dihybrid
c. single, double
d. parental, F1
6. A population is ______.
a. located in the same geographic area
b. composed of one species
c. the smallest unit that can evolve
d. all of the above
7. A population in Hardy-Weinberg equilibrium has two alleles, R and r, at a particular locus. The frequency of the “R” allele is 0.5. What is the percentage of the population that is heterozygous for this allele?
a. 15%
b. 20%
c. 25%
d. 50%
8. Eye color in fruit flies is sex linked. If a red eyes male fruit fly is crossed with a true breeding white eyed female and the F1 generation are inbred, what fraction of the F2 generation will be white eyed males?
a. 0
b. 1/16
c. 1/8
d. 1/4
9. Why were pea plants well suited for Mendel’s studies?
a. they grow fast
b. it is easy to control pollination experiments
c. each trait examined was on a separate chromosome
d. all of the above
10. What is the mRNA sequence that would pair with the DNA sequence CTAGGACTT?
a. AAGTCCTAG
b. GAUCCUGAA
c. GUTCCTCUU
d. GATCCTGAA
Matching:
1. Takes place when a population is divided geographically.
2. All the genes in a given population.
3. Used to find the genotype of an unknown.
4. A normal allele is referred to as _____.
5. Occurs when a few individuals become isolated from the larger population
6. A violation of the Hardy-Weinberg Equilibrium.
7. When a sudden change in the environment drastically changes the population size and alters the gene pool.
Z. Allopatric Speciation
Y. Non-random mating
X. Bottleneck Effect
W. Founder Effect
V. Gene Flow
U. Gene Pool
T. Sympatric Speciation
S. Testcross
R. Wild Type