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Evolution Of Populations Ch. 16
Test Description: Review questions for Chapter 16
Instructions: Answer all questions to get your test result.
1) The combined genetic information of all members of a particular population is the population’s
A
relative frequency.
B
phenotype
C
genotype
D
gene pool.
2) Which statement below about gene pools is typically true?
A
They belong to two or more interbreeding species.
B
They contain only dominant alleles.
C
The relative frequencies of the alleles never change.
D
They contain two or more alleles for each inheritable trait.
3) nterbreeding among members of a population results in
A
changes in the relative frequencies of alleles in the gene pool.
B
no changes in the relative frequencies of alleles in the gene pool.
C
an absence of genetic variation in the population.
D
different types of alleles in the gene pool.
4) In a population, the sum of the relative frequencies of all alleles for a particular trait is
A
equal to 100 percent.
B
constantly changing.
C
equal to the number of alleles for the trait.
D
dependent on the number of alleles.
5) The two main sources of genetic variation are
A
single-gene traits and polygenic traits.
B
directional selection and disruptive selection.
C
gene shuffling and mutations.
D
genotypes and phenotypes.
6) Gene shuffling includes the independent movement of chromosomes during meoisis as well as
A
changes in the frequencies of alleles.
B
crossing-over.
C
mutations from chemicals.
D
mutations from radiation.
7) The gene shuffling that occurs as part of sexual reproduction
A
changes the gene pool’s allele frequencies.
B
keeps the phenotypes consistent.
C
does not change the gene pool’s allele frequencies.
D
is caused by radiation or chemicals.
8) single-gene trait that has two alleles and that shows a simple dominant-recessive pattern will result in
A
one phenotype.
B
millions of phenotypes.
C
two phenotypes.
D
four phenotypes.
9) The number of phenotypes produced for a given trait depends upon
A
the relative frequencies of the various alleles.
B
the relationship of allele frequencies to Mendelian ratios
C
the number of genes that control the trait.
D
which form of the trait is dominant.
10) Compared to a polygenic trait, a single-gene trait tends to have
A
the same number of phenotypes.
B
fewer phenotypes.
C
phenotypes that form a bell-shaped curve.
D
more phenotypes.
*select an answer for all questions
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