Question 1

Why is mutation an important element in accounting for the variation in mtDNA? What are the factors that redistribute genetic variation?

Accepted Answer

Mutation is an important element in acco

Question 2

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 1 
A)  15 to 1 
B)  3 to 1 
C)  ½ tall, ½ short 
D)  4 to 1 
E)  5 to 1

Question 3

Polygenic traits account for few, if any, of the readily observable phenotypic variation seen in humans.

Accepted Answer

A) True 
 B)False

Question 4

Mendelian traits

Accepted Answer

A)  are governed by more than one genetic locus 
B)  occur only in some people 
C)  are always dominant 
D)  are governed by one genetic locus 
E)  are always recessive 
A)  are governed by more than one genetic locus 
B)  occur only in some people 
C)  are always dominant 
D)  are governed by one genetic locus 
E)  are always recessive

Question 5

How do the basic principles of inheritance, identified by Mendel in plants, differ from those in humans?

Accepted Answer

A)  They are simpler. 
B)  Plants don't have alleles. 
C)  There are no differences since the basic principles are the same. 
D)  There are no Mendelian traits in humans. 
E)  The number of chromosomes is different; therefore the genetic principles are different. 
A)  They are simpler. 
B)  Plants don't have alleles. 
C)  There are no differences since the basic principles are the same. 
D)  There are no Mendelian traits in humans. 
E)  The number of chromosomes is different; therefore the genetic principles are different.

Question 6

When Mendel crossed true breeding tall and short parental plants, what was produced?

Accepted Answer

A)  All the offspring were tall. 
B)  Half the offspring were tall, the other half were short. 
C)  All the offspring were short. 
D)  The offspring were intermediate in height relative to the two parent plants. 
E)  About 90 percent were tall, but the rest were short. 
A)  All the offspring were tall. 
B)  Half the offspring were tall, the other half were short. 
C)  All the offspring were short. 
D)  The offspring were intermediate in height relative to the two parent plants. 
E)  About 90 percent were tall, but the rest were short.

Question 7

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)  none 
A)  3/4 
B)  All 
C)  1/4 
D)  2/3 
E)  none

Question 8

New alleles are the results of mutations.

Accepted Answer

A) True 
 B)False

Question 9

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

Accepted Answer

Genetic drift is a mechanism of evolutio

Question 10

What produces new alleles at a locus?

Accepted Answer

A)  natural selection 
B)  recombination 
C)  mutation 
D)  migration 
E)  genetic drift 
A)  natural selection 
B)  recombination 
C)  mutation 
D)  migration 
E)  genetic drift

Question 11

Which of the following types of traits are governed by more than one genetic locus?

Accepted Answer

A)  polygenic 
B)  dominant 
C)  Mendelian 
D)  recessive 
E)  pleiotropic 
A)  polygenic 
B)  dominant 
C)  Mendelian 
D)  recessive 
E)  pleiotropic

Question 12

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 13

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 shortness 
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 shortness

Question 14

A manifestation of sickle-cell anemia is the abnormal hemoglobin S reduces the ability of red blood cells to transport oxygen throughout the body.

Accepted Answer

A) True 
 B)False

Question 15

Dominance and recessiveness are all-or-nothing situations because the recessive allele has no phenotypic effects in heterozygotes.

Accepted Answer

A) True 
 B)False

Question 16

Allele frequencies are indicators of the genetic makeup of a population. Use the example of ABO blood types to show how allele frequencies change.

Accepted Answer

Allele frequencies are indicators of the

Question 17

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 offspring would be expected to be heterozygous?

Accepted Answer

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

Question 18

Explain Mendel's principle of segregation.

Accepted Answer

Mendel's principle of segregation states

Question 19

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 20

What are the typical Mendelian phenotypic and genotypic ratios in the F2 generation for a cross of purebred tall and short plants? Why are these ratios typical?

Accepted Answer

To provide an answer to your question, w

Why is mutation an important element in accounting for the variation in mtDNA? What are the factors that redistribute genetic variation?

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

Polygenic traits account for few, if any, of the readily observable phenotypic variation seen in humans.

Mendelian traits

How do the basic principles of inheritance, identified by Mendel in plants, differ from those in humans?

When Mendel crossed true breeding tall and short parental plants, what was produced?

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?

New alleles are the results of mutations.

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

What produces new alleles at a locus?

Which of the following types of traits are governed by more than one genetic locus?

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.

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

A manifestation of sickle-cell anemia is the abnormal hemoglobin S reduces the ability of red blood cells to transport oxygen throughout the body.

Dominance and recessiveness are all-or-nothing situations because the recessive allele has no phenotypic effects in heterozygotes.

Allele frequencies are indicators of the genetic makeup of a population. Use the example of ABO blood types to show how allele frequencies change.

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 offspring would be expected to be heterozygous?

Explain Mendel's principle of segregation.

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

What are the typical Mendelian phenotypic and genotypic ratios in the F₂ generation for a cross of purebred tall and short plants? Why are these ratios typical?

Introduction to Physical Anthropology

The Development of Evolutionary Theory

The Biological Basis of Life Connections

Processes of Macroevolution

An Overview of the Primates

Primate Behavior

Primate and Hominin Origins

The First Dispersal of the Genus Homo: Homo Erectus and Contemporaries

Premodern Humans

The Origin and Dispersal of Modern Humans

Human Variation and Adaptation

Legacies of Human Evolutionary History: Effects on the Individual

The Human Disconnection

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Exam 4: Heredity and Evolution

Why is mutation an important element in accounting for the variation in mtDNA? What are the factors that redistribute genetic variation?

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

Polygenic traits account for few, if any, of the readily observable phenotypic variation seen in humans.

Mendelian traits

How do the basic principles of inheritance, identified by Mendel in plants, differ from those in humans?

When Mendel crossed true breeding tall and short parental plants, what was produced?

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?

New alleles are the results of mutations.

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

What produces new alleles at a locus?

Which of the following types of traits are governed by more than one genetic locus?

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.

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

A manifestation of sickle-cell anemia is the abnormal hemoglobin S reduces the ability of red blood cells to transport oxygen throughout the body.

Dominance and recessiveness are all-or-nothing situations because the recessive allele has no phenotypic effects in heterozygotes.

Allele frequencies are indicators of the genetic makeup of a population. Use the example of ABO blood types to show how allele frequencies change.

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 offspring would be expected to be heterozygous?

Explain Mendel's principle of segregation.

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.

What are the typical Mendelian phenotypic and genotypic ratios in the F2 generation for a cross of purebred tall and short plants? Why are these ratios typical?

Introduction to Physical Anthropology

The Development of Evolutionary Theory

The Biological Basis of Life Connections

Processes of Macroevolution

An Overview of the Primates

Primate Behavior

Primate and Hominin Origins

The First Dispersal of the Genus Homo: Homo Erectus and Contemporaries

Premodern Humans

The Origin and Dispersal of Modern Humans

Human Variation and Adaptation

Legacies of Human Evolutionary History: Effects on the Individual

The Human Disconnection

Filters

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

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

What are the typical Mendelian phenotypic and genotypic ratios in the F₂ generation for a cross of purebred tall and short plants? Why are these ratios typical?