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Biod 171 Exam 2 Quizzes
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Biod 171 Exam 2 QuizzesTrue or false: Genetic differences are always more important than environmental
differences for determining phenotypic outcomes.
false
true
Correct answer- false
If Mendel based his data only on two traits, and the genes influencing those traits were
linked and located close together on the same chromosome, which of his laws would he
not have been able to resolve?
The Law of Segregation
The Law of Independent Assortment
Correct answer- The Law of Independent Assortment
Which of the following types of inheritance violate Mendel's law of independent
assortment?
Sex linkage
Linkage between alleles on the same chromosome
Epistasis
Mitochondrial inheritance
Codominance
Correct answer- Linkage between alleles on the same chromosome
True or false: When studying phenotypic variations due to the environment, it is
necessary to compare organisms with identical genotypes. In addition, it is necessary to
use identical environments when studying variation in genotypes.
true
false
Correct answer- true
The differential reproductive success of individuals who carry a particular allele in a
given environment is called ____________.
fixation
selection
evolution
migration
genetic drift
,Correct answer- selection
What kind of mutation has no effect on an organism's ability to survive or reproduce?
an advantageous mutation
a neutral mutation
an adaptive mutation
a deleterious mutation
Correct answer- a neutral mutation
Given equal probabilities of the birth of a boy or girl, what is the probability that a group
of four siblings includes all boys? All girls? All boys or all girls?
1/16; 1/16; 1/64
1/8; 1/16; 3/8
1/16; 1/8; 3/8
1/16; 1/16; 1/8
Correct answer- 1/16; 1/16; 1/8
Choose one single BEST answer to complete this sentence. The frequency of
recombination during meiosis is a function of:
the distance between genes: the closer the genes are, the more frequent the
recombination between them.
the alleles on the genes; recombination happens less frequently among recessive
alleles.
whether or not the genes are sex-linked; Y chromosomes recombine much more
frequently than do the autosomes.
whether or not the genes are sex-linked; X chromosomes recombine much more
frequently than do autosomes.
the distance between genes: the farther apart the genes are, the more frequent the
recombination between them.
Correct answer- the distance between genes: the farther apart the genes are, the more
frequent the recombination between them.
In one set of experiments, Calvin Bridges crossed white-eyed female fruit flies with red-
eyed males. Some of the offspring were white-eyed females. These individuals, he
demonstrated, had the genotype ____________, which occurred because of
____________ during meiosis. (Hint: see Figure 17.6)
XXO; independent assortment
XXY; nondisjunction
XXY; random segregation
XXX; nondisjunction
Correct answer- XXY; nondisjunction
, Hammer-head bats are a species of African fruit bats. During the breeding season,
males gather in mating arenas, where they display to females who pass through and
assess males before selecting individuals with which to mate. This is an example of
____________-sexual selection.
inter
intra
Correct answer- inter
On a hike through the forest, you notice a population of 100 flowering plants that all look
identical (phenotypic clones). They span an area of approximately 100 square meters
but there are other populations of this species nearby. You take some representatives
from one corner of their distribution back to the lab, sequence their DNA and conclude
that they are also genetic clones.
True or false: This population can ONLY evolve through genetic drift.
false
true
Correct answer- false
Genetic drift has an especially significant effect in what kind of populations?
populations with high genetic variability
populations that are large
populations that are small
populations that are subject to natural selection
populations that are migrating
Correct answer- populations that are small
Females are generally "choosier" than males about who they mate with.
False
True
Correct answer- True
What does it mean to say that an allele is "fixed" in the population?
It has been repaired by typical mechanisms in the cell.
It is an indication of no genetic variation at that locus in the population.
It is an indication that locus cannot undergo mutation.
It is an indication of high genetic variation at that locus in the population.
It is an indication of low genetic variation at that locus in the population.
Correct answer- It is an indication of no genetic variation at that locus in the population.
One oak tree produces two kinds of leaves: large with shallow lobes and narrow with
deep lobes. If this variation in leaf shape is based solely on the ecological condition of
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