Question 1

Polygenic traits include

Accepted Answer

A)  eye color and hair colors other than pure blond or red. 
B)  a lack of A and B surface antigens and presence of RH factor. 
C)  inability to roll the tongue into a U-shape and near-sightedness. 
D)  photic sneeze reflex and attached earlobes. 
E)  ability to taste phenylthiocarbamate and color blindness. 
A)  eye color and hair colors other than pure blond or red. 
B)  a lack of A and B surface antigens and presence of RH factor. 
C)  inability to roll the tongue into a U-shape and near-sightedness. 
D)  photic sneeze reflex and attached earlobes. 
E)  ability to taste phenylthiocarbamate and color blindness. A

Question 2

Figure 20-1 Events in Implantation
Use Figure 20-1 to identify the labeled part.
-Label C represents which of the following structures?

Accepted Answer

A)  blastocoele 
B)  blastocyst 
C)  trophoblast 
D)  developing villi 
E)  chorion 
A)  blastocoele 
B)  blastocyst 
C)  trophoblast 
D)  developing villi 
E)  chorion C

Question 3

At which gestational age do basic heart structures, major blood vessels, lymph nodes, and ducts form?

Accepted Answer

A)  month 6 
B)  month 8 
C)  month 4 
D)  month 7 
E)  month 2 
A)  month 6 
B)  month 8 
C)  month 4 
D)  month 7 
E)  month 2 E

Question 4

If the parents are AA and aa, the offspring are all expected to be

Accepted Answer

A)  sterile. 
B)  Aa. 
C)  AA. 
D)  aa. 
E)  either AA or aa. 
A)  sterile. 
B)  Aa. 
C)  AA. 
D)  aa. 
E)  either AA or aa.

Question 5

The period of gestation when the basic components of each of the major organ systems appear is the ________ trimester(s).

Accepted Answer

A)  first 
B)  second 
C)  third 
D)  first and second 
E)  second and third 
A)  first 
B)  second 
C)  third 
D)  first and second 
E)  second and third

Question 6

The outer layer of cells separating the outside world from the blastocoele is called the

Accepted Answer

A)  trophoblast. 
B)  chorion. 
C)  inner cell mass. 
D)  zona pellucida. 
E)  blastomere. 
A)  trophoblast. 
B)  chorion. 
C)  inner cell mass. 
D)  zona pellucida. 
E)  blastomere.

Question 7

In humans, the 22 pairs of chromosomes, which contain most of the genes that affect somatic characteristics such as hair color and skin pigmentation, are called

Accepted Answer

A)  alleles. 
B)  heterozygous chromosomes. 
C)  homologous chromosomes. 
D)  autosomal chromosomes. 
E)  homozygous chromosomes. 
A)  alleles. 
B)  heterozygous chromosomes. 
C)  homologous chromosomes. 
D)  autosomal chromosomes. 
E)  homozygous chromosomes.

Question 8

Figure 20-1 Events in Implantation
Use Figure 20-1 to identify the labeled part.
-Label J represents which of the following structures?

Accepted Answer

A)  syncytial trophoblast 
B)  developing villi 
C)  lacuna 
D)  uterine gland 
E)  amniotic cavity 
A)  syncytial trophoblast 
B)  developing villi 
C)  lacuna 
D)  uterine gland 
E)  amniotic cavity

Question 9

Regarding Fragile-X syndrome,

Accepted Answer

A)  the affected females have nonfunctional ovaries, and estrogen production occurs at negligible levels. 
B)  the cause is trisomy, a mistake that occurs in meiosis, and affected individuals carry an extra chromosome. 
C)  the phenotype is male, but the testes fail to mature so the individuals are sterile, and the breasts are slightly enlarged. 
D)  the cause is a kind of chromosomal deletion known as monosomy where the phenotype is normal female. 
E)  the affected individuals display mental retardation, abnormal facial development, and enlarged testes in affected males. 
A)  the affected females have nonfunctional ovaries, and estrogen production occurs at negligible levels. 
B)  the cause is trisomy, a mistake that occurs in meiosis, and affected individuals carry an extra chromosome. 
C)  the phenotype is male, but the testes fail to mature so the individuals are sterile, and the breasts are slightly enlarged. 
D)  the cause is a kind of chromosomal deletion known as monosomy where the phenotype is normal female. 
E)  the affected individuals display mental retardation, abnormal facial development, and enlarged testes in affected males.

Question 10

Paired chromosomes are called

Accepted Answer

A)  homologous chromosomes. 
B)  autosomal chromosomes. 
C)  homozygous chromosomes. 
D)  heterozygous chromosomes. 
E)  alleles. 
A)  homologous chromosomes. 
B)  autosomal chromosomes. 
C)  homozygous chromosomes. 
D)  heterozygous chromosomes. 
E)  alleles.

Question 11

The chorionic villi

Accepted Answer

A)  help prepare the mammary glands for milk production. 
B)  are free endodermal tips that grow toward the wall of the blastocyst. 
C)  bulge into the amniotic cavity at the head fold and extend toward the trophoblast. 
D)  provide the surface area for gaseous exchange between fetal and maternal bloodstreams. 
E)  form constrictions that narrow the yolk stalk and the body stalk between the embryo and the surrounding trophoblast. 
A)  help prepare the mammary glands for milk production. 
B)  are free endodermal tips that grow toward the wall of the blastocyst. 
C)  bulge into the amniotic cavity at the head fold and extend toward the trophoblast. 
D)  provide the surface area for gaseous exchange between fetal and maternal bloodstreams. 
E)  form constrictions that narrow the yolk stalk and the body stalk between the embryo and the surrounding trophoblast.

Question 12

Individuals with ________ have only one sex chromosome, and it is an X chromosome.

Accepted Answer

A)  Trisomy 21 
B)  Down's syndrome 
C)  Turner's syndrome 
D)  Fragile-X syndrome 
E)  Klinefelter's syndrome 
A)  Trisomy 21 
B)  Down's syndrome 
C)  Turner's syndrome 
D)  Fragile-X syndrome 
E)  Klinefelter's syndrome

Question 13

In polygenic inheritance,

Accepted Answer

A)  phenotypic characteristics are always controlled by genes on a single chromosome. 
B)  phenotypic characteristics are determined by interactions among several genes. 
C)  phenotypic characteristics are determined by the genes on the Y chromosome. 
D)  phenotypic characteristics are determined by a single pair of alleles. 
E)  phenotypic characteristics are determined by the action of a single gene. 
A)  phenotypic characteristics are always controlled by genes on a single chromosome. 
B)  phenotypic characteristics are determined by interactions among several genes. 
C)  phenotypic characteristics are determined by the genes on the Y chromosome. 
D)  phenotypic characteristics are determined by a single pair of alleles. 
E)  phenotypic characteristics are determined by the action of a single gene.

Question 14

When labor begins, the fetal pituitary gland secretes ________, which may be the actual trigger for the onset of labor.

Accepted Answer

A)  prolactin 
B)  hCG 
C)  oxytocin 
D)  growth hormone 
E)  thyroxine 
A)  prolactin 
B)  hCG 
C)  oxytocin 
D)  growth hormone 
E)  thyroxine

Question 15

Which extraembryonic membrane is an important site of blood cell production?

Accepted Answer

A)  placenta 
B)  yolk sac 
C)  amnion 
D)  allantois 
E)  chorion 
A)  placenta 
B)  yolk sac 
C)  amnion 
D)  allantois 
E)  chorion

Question 16

The morula stage occurs during which process?

Accepted Answer

A)  embryogenesis 
B)  placentation 
C)  gastrulation 
D)  implantation 
E)  cleavage 
A)  embryogenesis 
B)  placentation 
C)  gastrulation 
D)  implantation 
E)  cleavage

Question 17

Which of the following is a recessive trait?

Accepted Answer

A)  red hair 
B)  color blindness 
C)  eye color 
D)  hemoglobin molecular structure 
E)  height 
A)  red hair 
B)  color blindness 
C)  eye color 
D)  hemoglobin molecular structure 
E)  height

Question 18

Hemophilia is a(n)

Accepted Answer

A)  example of dominance. 
B)  example of codominance. 
C)  polygenic trait. 
D)  recessive trait. 
E)  sex-linked trait. 
A)  example of dominance. 
B)  example of codominance. 
C)  polygenic trait. 
D)  recessive trait. 
E)  sex-linked trait.

Question 19

If the gonads fail to develop very early during human development, the contributions of which germ layer may be deficient?

Accepted Answer

A)  epiderm 
B)  ectoderm 
C)  periderm 
D)  endoderm 
E)  mesoderm 
A)  epiderm 
B)  ectoderm 
C)  periderm 
D)  endoderm 
E)  mesoderm

Question 20

Match the gestational age with the corresponding prenatal development.

Accepted Answer

A)  1 month / mammary glands develop 
B)  2 months / movement of fetus can be felt by mother 
C)  3 months / formation of the gonads, ducts, and genitalia 
D)  4 months / eye and ear formation 
E)  5 months / migration of lymphocytes to lymphoid organs 
A)  1 month / mammary glands develop 
B)  2 months / movement of fetus can be felt by mother 
C)  3 months / formation of the gonads, ducts, and genitalia 
D)  4 months / eye and ear formation 
E)  5 months / migration of lymphocytes to lymphoid organs

Polygenic traits include

Figure 20-1 Events in Implantation Use Figure 20-1 to identify the labeled part. -Label C represents which of the following structures?

At which gestational age do basic heart structures, major blood vessels, lymph nodes, and ducts form?

If the parents are AA and aa, the offspring are all expected to be

The period of gestation when the basic components of each of the major organ systems appear is the ________ trimester(s).

The outer layer of cells separating the outside world from the blastocoele is called the

In humans, the 22 pairs of chromosomes, which contain most of the genes that affect somatic characteristics such as hair color and skin pigmentation, are called

Figure 20-1 Events in Implantation Use Figure 20-1 to identify the labeled part. -Label J represents which of the following structures?

Regarding Fragile-X syndrome,

Paired chromosomes are called

The chorionic villi

Individuals with ________ have only one sex chromosome, and it is an X chromosome.

In polygenic inheritance,

When labor begins, the fetal pituitary gland secretes ________, which may be the actual trigger for the onset of labor.

Which extraembryonic membrane is an important site of blood cell production?

The morula stage occurs during which process?

Which of the following is a recessive trait?

Hemophilia is a(n)

If the gonads fail to develop very early during human development, the contributions of which germ layer may be deficient?

Match the gestational age with the corresponding prenatal development.

An Introduction to Anatomy and Physiology

The Chemical Level of Organization

Cell Structure and Function

The Tissue Level of Organization

The Integumentary System

The Skeletal System

The Muscular System

The Nervous System

The General and Special Senses

The Endocrine System

The Cardiovascular System: Blood

The Cardiovascular System: the Heart

The Cardiovascular System: Blood Vessels and Circulation

The Lymphatic System and Immunity

The Respiratory System

The Digestive System

Metabolism and Energetics

The Urinary System

The Reproductive System

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Exam 20: Development and Inheritance

Polygenic traits include

Figure 20-1 Events in Implantation Use Figure 20-1 to identify the labeled part. -Label C represents which of the following structures?

At which gestational age do basic heart structures, major blood vessels, lymph nodes, and ducts form?

If the parents are AA and aa, the offspring are all expected to be

The period of gestation when the basic components of each of the major organ systems appear is the ________ trimester(s).

The outer layer of cells separating the outside world from the blastocoele is called the

In humans, the 22 pairs of chromosomes, which contain most of the genes that affect somatic characteristics such as hair color and skin pigmentation, are called

Figure 20-1 Events in Implantation Use Figure 20-1 to identify the labeled part. -Label J represents which of the following structures?

Regarding Fragile-X syndrome,

Paired chromosomes are called

The chorionic villi

Individuals with ________ have only one sex chromosome, and it is an X chromosome.

In polygenic inheritance,

When labor begins, the fetal pituitary gland secretes ________, which may be the actual trigger for the onset of labor.

Which extraembryonic membrane is an important site of blood cell production?

The morula stage occurs during which process?

Which of the following is a recessive trait?

Hemophilia is a(n)

If the gonads fail to develop very early during human development, the contributions of which germ layer may be deficient?

Match the gestational age with the corresponding prenatal development.

An Introduction to Anatomy and Physiology

The Chemical Level of Organization

Cell Structure and Function

The Tissue Level of Organization

The Integumentary System

The Skeletal System

The Muscular System

The Nervous System

The General and Special Senses

The Endocrine System

The Cardiovascular System: Blood

The Cardiovascular System: the Heart

The Cardiovascular System: Blood Vessels and Circulation

The Lymphatic System and Immunity

The Respiratory System

The Digestive System

Metabolism and Energetics

The Urinary System

The Reproductive System

Filters