Question 1

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 traits. 
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 traits. B

Question 2

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 B

Question 3

Recessive conditions are usually associated with the lack of production of an enzyme.

Accepted Answer

A) True 
 B)False  True

Question 4

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 because 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 because 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 5

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 discrete or discontinuous. 
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 discrete or discontinuous. 
E) are always recessive.

Question 6

Mendelian traits

Accepted Answer

A) are governed by several genetic loci. 
B) are more likely to have identifiable loci than polygenic traits. 
C) have continuous distributions. 
D) can be described by statistics such as the average and standard deviation. 
E) have phenotypic expressions that are often the result of genetic and environmental interactions. 
A) are governed by several genetic loci. 
B) are more likely to have identifiable loci than polygenic traits. 
C) have continuous distributions. 
D) can be described by statistics such as the average and standard deviation. 
E) have phenotypic expressions that are often the result of genetic and environmental interactions.

Question 7

Short-term effects on inherited traits are sometimes called

Accepted Answer

A) macroevolution. 
B) plieotropy. 
C) microevolution. 
D) speciation. 
E) natural selection. 
A) macroevolution. 
B) plieotropy. 
C) microevolution. 
D) speciation. 
E) natural selection.

Question 8

Dominant alleles

Accepted Answer

A) usually cause the underproduction of an enzyme. 
B) always produce the most desirable phenotype. 
C) can mask the expression of other alleles at the same locus. 
D) are always the most common allele in a population. 
E) were discovered by Charles Darwin. 
A) usually cause the underproduction of an enzyme. 
B) always produce the most desirable phenotype. 
C) can mask the expression of other alleles at the same locus. 
D) are always the most common allele in a population. 
E) were discovered by Charles Darwin.

Question 9

Allele frequencies are indicators of the genetic makeup of a population, the members of which share a common gene pool.

Accepted Answer

A) True 
 B)False

Question 10

Type AB blood is an example of

Accepted Answer

A) codominance. 
B) blending. 
C) recessiveness. 
D) dominance. 
E) polygenic inheritance. 
A) codominance. 
B) blending. 
C) recessiveness. 
D) dominance. 
E) polygenic inheritance.

Question 11

The observed physical manifestation of genes is the

Accepted Answer

A) genotype. 
B) phenotype. 
C) phenotypic ratio. 
D) genotypic ratio. 
E) independent assortment. 
A) genotype. 
B) phenotype. 
C) phenotypic ratio. 
D) genotypic ratio. 
E) independent assortment.

Question 12

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

Accepted Answer

A) True 
 B)False

Question 13

A person who is homozygous recessive at a locus has

Accepted Answer

A) two copies of the recessive allele. 
B) two copies of the dominant allele. 
C) an autosomal trisomy. 
D) a recessive allele on the X chromosome only. 
E) a recessive allele on the Y chromosome only. 
A) two copies of the recessive allele. 
B) two copies of the dominant allele. 
C) an autosomal trisomy. 
D) a recessive allele on the X chromosome only. 
E) a recessive allele on the Y chromosome only.

Question 14

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

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 color 
A) Stature 
B) Skin color 
C) Eye color 
D) ABO blood type 
E) Hair color

Question 16

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

Accepted Answer

In modern genetics, dominance, codominan

Question 17

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

Accepted Answer

A) were heterozygous 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 homozygous for the allele for tallness. 
A) were heterozygous 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 homozygous for the allele for tallness.

Question 18

How many ABO phenotypes are there?

Accepted Answer

A) 4 
B) 2 
C) 3 
D) 6 
E) 1 
A) 4 
B) 2 
C) 3 
D) 6 
E) 1

Question 19

Melanin production is a polygenic trait that is influenced by the interactions between several different loci.

Accepted Answer

A) True 
 B)False

Question 20

A trait is NOT expressed in heterozygotes, it is said to be

Accepted Answer

A) dominant. 
B) codominant. 
C) recessive. 
D) homozygous dominant. 
E) segregated. 
A) dominant. 
B) codominant. 
C) recessive. 
D) homozygous dominant. 
E) segregated.

Polygenic traits

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?

Recessive conditions are usually associated with the lack of production of an enzyme.

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

Mendelian traits

Mendelian traits

Short-term effects on inherited traits are sometimes called

Dominant alleles

Allele frequencies are indicators of the genetic makeup of a population, the members of which share a common gene pool.

Type AB blood is an example of

The observed physical manifestation of genes is the

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

A person who is homozygous recessive at a locus has

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?

Which of the following is NOT a polygenic trait?

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

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

How many ABO phenotypes are there?

Melanin production is a polygenic trait that is influenced by the interactions between several different loci.

A trait is NOT expressed in heterozygotes, it is said to be

Introduction to Physical Anthropology

The Development of Evolutionary Theory

The Biological Basis of Life

Macroevolution: Processes of Vertebrate and Mammalian Evolution

Survey of the Living Primates

Primate Behavior

Overview of the Fossil Primates

Paleoanthropology: Reconstructing Early Hominin Behavior and Ecology

Hominin Origins in Africa

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

Premodern Humans

The Origin and Dispersal of Modern Humans

Modern Human Biology: Patterns of Variation

Modern Human Biology: Patterns of Adaptation

Legacies of Human Evolutionary History: Effects on the Human Life Course

The Human Disconnection

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Exam 4: Heredity and Evolution

Polygenic traits

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?

Recessive conditions are usually associated with the lack of production of an enzyme.

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

Mendelian traits

Mendelian traits

Short-term effects on inherited traits are sometimes called

Dominant alleles

Allele frequencies are indicators of the genetic makeup of a population, the members of which share a common gene pool.

Type AB blood is an example of

The observed physical manifestation of genes is the

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

A person who is homozygous recessive at a locus has

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?

Which of the following is NOT a polygenic trait?

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

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

How many ABO phenotypes are there?

Melanin production is a polygenic trait that is influenced by the interactions between several different loci.

A trait is NOT expressed in heterozygotes, it is said to be

Introduction to Physical Anthropology

The Development of Evolutionary Theory

The Biological Basis of Life

Macroevolution: Processes of Vertebrate and Mammalian Evolution

Survey of the Living Primates

Primate Behavior

Overview of the Fossil Primates

Paleoanthropology: Reconstructing Early Hominin Behavior and Ecology

Hominin Origins in Africa

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

Premodern Humans

The Origin and Dispersal of Modern Humans

Modern Human Biology: Patterns of Variation

Modern Human Biology: Patterns of Adaptation

Legacies of Human Evolutionary History: Effects on the Human Life Course

The Human Disconnection

Filters