Question 1

In Mendel's experiments, the tall parental (P)  plants

Accepted Answer

A)   were homozygous for the allele for tallness
B)   were heterozygous at the locus controlling height
C)   could NOT be crossed with short plants
D)   were homozygous for the allele for shortness
E)   were heterozygous for the allele for shortnessF) All of the above
G) A) and D)

Question 2

In order for a mutation to be passed on to offspring, the mutation must

Accepted Answer

A)   occur in a gamete
B)   be beneficial
C)   occur in a somatic cell
D)   result in additional chromosomes
E)   have negative evolutionary consequencesF) C) and E)
G) C) and D)

Question 3

Define genetic drift. How are founder effect and genetic drift related?

Accepted Answer

Genetic drift is a mechanism of evolutio...

Question 4

All human genetic disorders are inherited as recessive traits.

Accepted Answer

A) True 
 B)False

Question 5

The relationship between malaria and the HbS allele is an example of natural selection as a factor that can cause directional change in allele frequencies.

Accepted Answer

A) True 
 B)False

Question 6

In regions where malaria is present, it acts as a selective agent that favors the heterozygous phenotype, because people with sickle-cell trait produce more offspring than those with only normal hemoglobin, who may die of malaria.

Accepted Answer

A) True 
 B)False

Question 7

In Mendel's experiments, what was the ratio of tall to short plants in the F2 generation?

Accepted Answer

A)   15 to 1
B)   3 to 1
C)   ½ tall, ½ short
D)   4 to 1
E)   5 to 1F) All of the above
G) B) and D)

Question 8

New alleles are the results of mutations.

Accepted Answer

A) True 
 B)False

Question 9

Explain Mendel's principle of segregation.

Accepted Answer

Mendel's principle of segregation states...

Question 10

Two people (both heterozygotes)  are able to taste a chemical substance called PTC. The ability to taste PTC is caused by a dominant allele (T) . The inability to taste PTC is caused by a recessive allele (t) . What proportion of their children would be expected not to be able to taste PTC?

Accepted Answer

A)   3/4
B)   All
C)   1/4
D)   2/3
E)   noneF) B) and E)
G) A) and E)

Question 11

Mitochondrial DNA (mtDNA) is extremely useful for studying genetic change over time.

Accepted Answer

A) True 
 B)False

Question 12

What is meant by the statement, "natural selection is the one factor that can cause directional change in allele frequency relative to specific environmental factors"?

Accepted Answer

The statement "natural selection is the ...

Question 13

Which statement concerning polygenic traits is not true?

Accepted Answer

A)   They are governed by more than one genetic locus.
B)   Their expression is often influenced by genetic/environmental interactions.
C)   The alleles have an additive effect on the phenotype.
D)   They are continuous traits
E)   The most frequently discussed are skin, hair and eye color.F) B) and C)
G) A) and D)

Question 14

What produces new alleles at a locus?

Accepted Answer

A)   natural selection
B)   recombination
C)   mutation
D)   migration
E)   genetic driftF) B) and E)
G) A) and D)

Question 15

Which of the following is not a polygenic trait?

Accepted Answer

A)   stature
B)   skin color
C)   eye color
D)   ABO blood type
E)   hair colorF) D) and E)
G) A) and D)

Question 16

What is an individual's actual genetic make-up called?

Accepted Answer

A)   phenotype
B)   homozygosity
C)   recessiveness
D)   phenotypic ratio
E)   genotypeF) All of the above
G) C) and D)

Question 17

Discuss the differences between Mendelian and polygenic modes of inheritance. Provide an example of a Mendelian and a polygenic trait.

Accepted Answer

Mendelian inheritance and polygenic inhe...

Question 18

Genetic drift is

Accepted Answer

A)   the change in allele frequencies produced by random factors
B)   the result of large populations
C)   the opposite of founder effect
D)   not evolutionary change
E)   the change in allele frequencies produced by nonrandom factorsF) C) and D)
G) A) and B)

Question 19

The ABO blood type system consists of ______ alleles.

Accepted Answer

A)   6
B)   4
C)   3
D)   2
E)   5F) C) and D)
G) A) and B)

Question 20

Gregor Mendel is known for which of the following?

Accepted Answer

A)   He developed theories of evolutionary change.
B)   He discovered the structure of the DNA molecule.
C)   He studied characteristics that are influenced by several genetic loci.
D)   He discovered the fundamental principles of how traits are inherited.
E)   He developed the theory of inheritance of acquired characteristics.F) A) and D)
G) C) and D)

Exam 2: Heredity and Evolution

Two people (both heterozygotes) are able to taste a chemical substance called PTC. The ability to taste PTC is caused by a dominant allele (T) . The inability to taste PTC is caused by a recessive allele (t) . What proportion of their children would be expected not to be able to taste PTC?

Correct AnswerverifiedShow Answer

In regions where malaria is present, it acts as a selective agent that favors the heterozygous phenotype, because people with sickle-cell trait produce more offspring than those with only normal hemoglobin, who may die of malaria.

Correct AnswerverifiedShow Answer

What produces new alleles at a locus?

Correct AnswerverifiedShow Answer

Which statement concerning polygenic traits is not true?

Correct AnswerverifiedShow Answer

The ABO blood type system consists of ______ alleles.

Correct AnswerverifiedShow Answer

Gregor Mendel is known for which of the following?

Correct AnswerverifiedShow Answer

Which of the following is not a polygenic trait?

Correct AnswerverifiedShow Answer

What is an individual's actual genetic make-up called?

Correct AnswerverifiedShow Answer

What is meant by the statement, "natural selection is the one factor that can cause directional change in allele frequency relative to specific environmental factors"?

Correct AnswerAnswered by ExamLex AIThe statement "natural selection is the ...View AnswerShow Answer

The relationship between malaria and the HbS allele is an example of natural selection as a factor that can cause directional change in allele frequencies.

Correct AnswerverifiedShow Answer

In Mendel's experiments, the tall parental (P) plants

Correct AnswerverifiedShow Answer

In Mendel's experiments, what was the ratio of tall to short plants in the F2 generation?

Correct AnswerverifiedShow Answer

New alleles are the results of mutations.

Correct AnswerverifiedShow Answer

In order for a mutation to be passed on to offspring, the mutation must

Correct AnswerverifiedShow Answer

Define genetic drift. How are founder effect and genetic drift related?

Correct AnswerAnswered by ExamLex AIGenetic drift is a mechanism of evolutio...View AnswerShow Answer

All human genetic disorders are inherited as recessive traits.

Correct AnswerverifiedShow Answer

Discuss the differences between Mendelian and polygenic modes of inheritance. Provide an example of a Mendelian and a polygenic trait.

Correct AnswerAnswered by ExamLex AIMendelian inheritance and polygenic inhe...View AnswerShow Answer

Explain Mendel's principle of segregation.

Correct AnswerAnswered by ExamLex AIMendel's principle of segregation states...View AnswerShow Answer

Mitochondrial DNA (mtDNA) is extremely useful for studying genetic change over time.

Correct AnswerverifiedShow Answer

Genetic drift is

Correct AnswerverifiedShow Answer

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The statement "natural selection is the ...
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Answered by ExamLex AI
Genetic drift is a mechanism of evolutio...
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Mendelian inheritance and polygenic inhe...
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Mendel's principle of segregation states...
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