Question 1

Explain Mendel's principle of independent assortment.

Accepted Answer

Mendel's principle of independent assort...

Question 2

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) A) and E)
G) A) and D)

Question 3

In a hypothetical situation, B is the allele that causes brachydactyly. If a man who has normal fingers bb)  and a woman with brachydactyly Bb)  have children, what proportion of these children would you expect to have normal fingers? Hint: Use a Punnett square) .

Accepted Answer

A)   None
B)   All
C)   1/4
D)   3/4
E)   1/2F) None of the above
G) All of the above

Question 4

Which of the statements below is false regarding the relationship between malaria and the HbS allele?

Accepted Answer

A)   There is no geographic correlation between the distribution of the HbS allele and malaria.
B)   Heterozygotes have greater resistance to malaria than homozygous individuals.
C)   The malarial parasite does not reproduce very well in the red blood cells of heterozygotes.
D)   Malaria is caused by the Plasmodium parasite.
E)   Most people are homozygous for the HbA allele.F) C) and E)
G) C) and D)

Question 5

Gregor Mendel

Accepted Answer

A)   published his results and won the Nobel Prize for his discoveries
B)   was trained as a geneticist
C)   did not know about chromosomes
D)   was a professor at the University of Vienna
E)   never published his workF) B) and C)
G) A) and D)

Question 6

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 7

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 8

The HbS allele increased in frequency in West African populations due to which of the following?

Accepted Answer

A)   sickle-cell anemia
B)   genetic drift
C)   migration
D)   increased mutation rates
E)   natural selectionF) B) and D)
G) C) and D)

Question 9

Explain how two parents who do NOT express a particular trait in their phenotype can nevertheless produce children who express the trait. Give an example of a specific trait or disease where this could occur.

Accepted Answer

This phenomenon can occur when both pare...

Question 10

At a hypothetical locus, a man's genotype is Aa. What proportion of his gametes would be expected to receive the A allele?

Accepted Answer

A)   All
B)   ½
C)   ¾
D)   ¼
E)   NoneF) All of the above
G) A) and B)

Question 11

The ABO blood type system consists of ______ alleles.

Accepted Answer

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

Question 12

What is it called when a person possesses two different alleles at the same locus, and both alleles are expressed in the phenotype?

Accepted Answer

A)   recessiveness
B)   codominance
C)   dominance
D)   homozygosity
E)   X-linkageF) C) and E)
G) B) and C)

Question 13

Evolution can be most succinctly defined as

Accepted Answer

A)   the appearance of new species
B)   the change from one species to another in one generation
C)   the change in allele frequency from one generation to the next
D)   any type of genetic mutation
E)   genetic driftF) A) and D)
G) A) and E)

Question 14

Polygenic traits

Accepted Answer

A)   are discrete
B)   have a continuous range of expression
C)   are controlled by only one genetic locus
D)   include the ABO blood type system and cystic fibrosis
E)   are also called Mendelian traitsF) None of the above
G) B) and C)

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) B) and E)
G) A) and B)

Question 16

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) A) and B)
G) A) and E)

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

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

Accepted Answer

A) True 
 B)False

Question 19

Evolution can be described as a two-stage process that includes which of the following?

Accepted Answer

A)   genetic drift followed by migration
B)   natural selection followed by migration
C)   recombination followed by mutation
D)   production of variation followed by natural selection acting on this variation
E)   production and distribution of variationF) A) and B)
G) B) and D)

Question 20

Explain the concepts of dominance, co-dominance, and recessiveness as used in modern genetics.

Accepted Answer

The answer of Explain the concepts of dominance, co-dominance, and...

Exam 4: Heredity and Evolution

Which of the statements below is false regarding the relationship between malaria and the HbS allele?

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

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The HbS allele increased in frequency in West African populations due to which of the following?

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

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Explain the concepts of dominance, co-dominance, and recessiveness as used in modern genetics.

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At a hypothetical locus, a man's genotype is Aa. What proportion of his gametes would be expected to receive the A allele?

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Evolution can be most succinctly defined as

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Explain how two parents who do NOT express a particular trait in their phenotype can nevertheless produce children who express the trait. Give an example of a specific trait or disease where this could occur.

Correct AnswerAnswered by ExamLex AIThis phenomenon can occur when both pare...View AnswerShow Answer

The ABO blood type system consists of ______ alleles.

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Gregor Mendel

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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

Evolution can be described as a two-stage process that includes which of the following?

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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

Explain Mendel's principle of independent assortment.

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Polygenic traits

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Which statement concerning polygenic traits is not true?

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In a hypothetical situation, B is the allele that causes brachydactyly. If a man who has normal fingers bb) and a woman with brachydactyly Bb) have children, what proportion of these children would you expect to have normal fingers? Hint: Use a Punnett square) .

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Which of the following is not a polygenic trait?

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

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What is it called when a person possesses two different alleles at the same locus, and both alleles are expressed in the phenotype?

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Which of the statements below is false regarding the relationship between malaria and the Hb^S allele?

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The Hb^S allele increased in frequency in West African populations due to which of the following?

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This phenomenon can occur when both pare...
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Mendelian inheritance and polygenic inhe...
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The statement "natural selection is the ...
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Mendel's principle of independent assort...
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