Question 1

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

Accepted Answer

A)  blastocyst 
B)  inner cell mass 
C)  trophoblast 
D)  syncytial trophoblast 
E)  cellular trophoblast 
A)  blastocyst 
B)  inner cell mass 
C)  trophoblast 
D)  syncytial trophoblast 
E)  cellular trophoblast

Question 2

The mesoderm forms (the)

Accepted Answer

A)  muscle. 
B)  epidermis. 
C)  neural tissues. 
D)  mucous epithelium of nasal passageways. 
E)  pituitary gland and adrenal medullae. 
A)  muscle. 
B)  epidermis. 
C)  neural tissues. 
D)  mucous epithelium of nasal passageways. 
E)  pituitary gland and adrenal medullae.

Question 3

The yolk stalk and body stalk fuse during week five, forming the

Accepted Answer

A)  amnion. 
B)  allantois. 
C)  chorion. 
D)  umbilical stalk. 
E)  primitive streak. 
A)  amnion. 
B)  allantois. 
C)  chorion. 
D)  umbilical stalk. 
E)  primitive streak.

Question 4

Joe and Jane desperately want to have children, and although they have tried for two years, they have not been successful. Finally, they both agree to consult a specialist, and it turns out that Joe suffers from oligospermia (a low sperm count). He doesn't understand why this would interfere with his ability to have children since he remembers from biology class that "it only takes one sperm to fertilize an egg." What should the specialist tell him?

Accepted Answer

Although what Joe says is technically tr

Question 5

Figure 20-1 Events in Implantation
Use Figure 20-1 to identify the labeled part.
-Label I 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 6

The extraembryonic membrane that forms the urinary bladder is the

Accepted Answer

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

Question 7

The stage of labor during which the fetus begins to shift toward the cervical canal is the

Accepted Answer

A)  emergence stage. 
B)  dilation stage. 
C)  placental stage. 
D)  expulsion stage. 
E)  fetal stage. 
A)  emergence stage. 
B)  dilation stage. 
C)  placental stage. 
D)  expulsion stage. 
E)  fetal stage.

Question 8

The portion of DNA that codes for a particular polypeptide is called a

Accepted Answer

A)  genome. 
B)  phenotype. 
C)  karyotype. 
D)  trait. 
E)  gene. 
A)  genome. 
B)  phenotype. 
C)  karyotype. 
D)  trait. 
E)  gene.

Question 9

When the alleles of a gene are both expressed equally, the alleles show a form of inheritance called

Accepted Answer

A)  codominance. 
B)  polygenic inheritance. 
C)  recessive inheritance. 
D)  sex linkage. 
E)  heterozygosity. 
A)  codominance. 
B)  polygenic inheritance. 
C)  recessive inheritance. 
D)  sex linkage. 
E)  heterozygosity.

Question 10

Human somatic cells contain ________ chromosomes.

Accepted Answer

A)  24, or 12 pairs of 
B)  46, or 23 pairs of 
C)  92, or 46 pairs of 
D)  12, or 6 pairs of 
E)  16, or 8 pairs of 
A)  24, or 12 pairs of 
B)  46, or 23 pairs of 
C)  92, or 46 pairs of 
D)  12, or 6 pairs of 
E)  16, or 8 pairs of

Question 11

Which extraembryonic structure is created as migrating mesodermal cells form a layer beneath the trophoblast, separating it from the blastocoele?

Accepted Answer

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

Question 12

A blastocyst is

Accepted Answer

A)  an extraembryonic membrane that forms blood vessels. 
B)  a solid ball of cells. 
C)  a hollow ball of cells. 
D)  a portion of the placenta. 
E)  the membrane that forms the urinary bladder. 
A)  an extraembryonic membrane that forms blood vessels. 
B)  a solid ball of cells. 
C)  a hollow ball of cells. 
D)  a portion of the placenta. 
E)  the membrane that forms the urinary bladder.

Question 13

Figure 20-1 Events in Implantation
Use Figure 20-1 to identify the labeled part.
-Label K 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

Question 14

What must be present for albinism to occur?

Accepted Answer

A)  heterozygosity 
B)  two dominant alleles 
C)  sex-linked alleles 
D)  two recessive alleles 
E)  polygenic alleles 
A)  heterozygosity 
B)  two dominant alleles 
C)  sex-linked alleles 
D)  two recessive alleles 
E)  polygenic alleles

Question 15

Fertilization of the ovum usually occurs

Accepted Answer

A)  within one hour of ovulation. 
B)  as much as three to four days following ovulation. 
C)  in the ovary. 
D)  in the upper third of the uterine tube. 
E)  in the uterus. 
A)  within one hour of ovulation. 
B)  as much as three to four days following ovulation. 
C)  in the ovary. 
D)  in the upper third of the uterine tube. 
E)  in the uterus.

Question 16

The first extraembryonic membrane to appear is the

Accepted Answer

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

Question 17

Differentiation is

Accepted Answer

A)  the transfer of genetic information from one generation to the next. 
B)  the gradual change in anatomical and physiological characteristics from conception to maturity. 
C)  the formation of more specialized cell types through selective changes in genetic activity. 
D)  the fusion of two haploid gametes that results in one diploid zygote. 
E)  a developmental stage of the embryo where body shape becomes discernable. 
A)  the transfer of genetic information from one generation to the next. 
B)  the gradual change in anatomical and physiological characteristics from conception to maturity. 
C)  the formation of more specialized cell types through selective changes in genetic activity. 
D)  the fusion of two haploid gametes that results in one diploid zygote. 
E)  a developmental stage of the embryo where body shape becomes discernable.

Question 18

Which of the following results from endodermal contributions?

Accepted Answer

A)  all cardiovascular components 
B)  brain and spinal cord 
C)  dermis and hypodermis 
D)  stem cells that produce gametes 
E)  nephrons 
A)  all cardiovascular components 
B)  brain and spinal cord 
C)  dermis and hypodermis 
D)  stem cells that produce gametes 
E)  nephrons

Question 19

Which statement regarding the neonatal renal system is true?

Accepted Answer

A)  Neonates can highly concentrate urine prior to excretion. 
B)  As waste products build up in venous blood, they are excreted at the kidneys. 
C)  Glomerular filtration does not occur until birth. 
D)  Glomerular filtration is normal. 
E)  Neonatal fluid requirements are proportionally much lower than those of adults. 
A)  Neonates can highly concentrate urine prior to excretion. 
B)  As waste products build up in venous blood, they are excreted at the kidneys. 
C)  Glomerular filtration does not occur until birth. 
D)  Glomerular filtration is normal. 
E)  Neonatal fluid requirements are proportionally much lower than those of adults.

Question 20

If an individual carries two different alleles of the same gene, he or she is ________ for the trait determined by that gene.

Accepted Answer

A)  homologous 
B)  homozygous 
C)  heterozygous 
D)  autosomal 
E)  polygenic 
A)  homologous 
B)  homozygous 
C)  heterozygous 
D)  autosomal 
E)  polygenic

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

The mesoderm forms (the)

The yolk stalk and body stalk fuse during week five, forming the

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

The extraembryonic membrane that forms the urinary bladder is the

The stage of labor during which the fetus begins to shift toward the cervical canal is the

The portion of DNA that codes for a particular polypeptide is called a

When the alleles of a gene are both expressed equally, the alleles show a form of inheritance called

Human somatic cells contain ________ chromosomes.

Which extraembryonic structure is created as migrating mesodermal cells form a layer beneath the trophoblast, separating it from the blastocoele?

A blastocyst is

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

What must be present for albinism to occur?

Fertilization of the ovum usually occurs

The first extraembryonic membrane to appear is the

Differentiation is

Which of the following results from endodermal contributions?

Which statement regarding the neonatal renal system is true?

If an individual carries two different alleles of the same gene, he or she is ________ for the trait determined by that gene.

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

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

The mesoderm forms (the)

The yolk stalk and body stalk fuse during week five, forming the

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

The extraembryonic membrane that forms the urinary bladder is the

The stage of labor during which the fetus begins to shift toward the cervical canal is the

The portion of DNA that codes for a particular polypeptide is called a

When the alleles of a gene are both expressed equally, the alleles show a form of inheritance called

Human somatic cells contain ________ chromosomes.

Which extraembryonic structure is created as migrating mesodermal cells form a layer beneath the trophoblast, separating it from the blastocoele?

A blastocyst is

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

What must be present for albinism to occur?

Fertilization of the ovum usually occurs

The first extraembryonic membrane to appear is the

Differentiation is

Which of the following results from endodermal contributions?

Which statement regarding the neonatal renal system is true?

If an individual carries two different alleles of the same gene, he or she is ________ for the trait determined by that gene.

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