Question 1

During implantation,

Accepted Answer

A)  the syncytial trophoblast erodes a path through the uterine epithelium. 
B)  the inner cell mass begins to form the placenta. 
C)  maternal blood vessels in the endometrium are walled off from the blastocyst. 
D)  the entire trophoblast becomes syncytial. 
E)  the inner cell mass is temporarily deprived of nutrients. 
A)  the syncytial trophoblast erodes a path through the uterine epithelium. 
B)  the inner cell mass begins to form the placenta. 
C)  maternal blood vessels in the endometrium are walled off from the blastocyst. 
D)  the entire trophoblast becomes syncytial. 
E)  the inner cell mass is temporarily deprived of nutrients.

Question 2

Which process begins as the surface of the blastocyst next to the inner cell mass adheres to the uterine lining?

Accepted Answer

A)  oocyte activation 
B)  placentation 
C)  embryogenesis 
D)  implantation 
E)  blastocyst formation 
A)  oocyte activation 
B)  placentation 
C)  embryogenesis 
D)  implantation 
E)  blastocyst formation

Question 3

The extraembryonic membrane that contains fluid that surrounds and cushions the developing embryo and fetus is known as the

Accepted Answer

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

Question 4

Which of the following is an autosomal dominant inherited disorder?

Accepted Answer

A)  Huntington's disease 
B)  sickle cell anemia 
C)  Duchenne muscular dystrophy 
D)  color blindness 
E)  deafness 
A)  Huntington's disease 
B)  sickle cell anemia 
C)  Duchenne muscular dystrophy 
D)  color blindness 
E)  deafness

Question 5

The most common viable chromosome abnormality is

Accepted Answer

A)  Fragile-X syndrome. 
B)  Trisomy 21. 
C)  Turner's syndrome. 
D)  Klinefelter's syndrome. 
E)  a translocation defect. 
A)  Fragile-X syndrome. 
B)  Trisomy 21. 
C)  Turner's syndrome. 
D)  Klinefelter's syndrome. 
E)  a translocation defect.

Question 6

Which of the following forms when blood vessels form in the chorion, around the periphery of the blastocyst?

Accepted Answer

A)  allantois 
B)  placenta 
C)  blastocoele 
D)  amnion 
E)  trophoblast 
A)  allantois 
B)  placenta 
C)  blastocoele 
D)  amnion 
E)  trophoblast

Question 7

A(n) ________ allele will always be expressed regardless of what the other allele happens to be.

Accepted Answer

A)  heterozygous 
B)  sex-linked 
C)  recessive 
D)  dominant 
E)  autosomal 
A)  heterozygous 
B)  sex-linked 
C)  recessive 
D)  dominant 
E)  autosomal

Question 8

Which of the following is a major hormonal event at the onset of puberty?

Accepted Answer

A)  The hypothalamus decreases its production of GnRH. 
B)  Circulating levels of FSH decrease rapidly. 
C)  Ovarian cells become less sensitive to FSH. 
D)  Testicular cells become less sensitive to LH and FSH. 
E)  Pituitary gland cells become more sensitive to GnRH. 
A)  The hypothalamus decreases its production of GnRH. 
B)  Circulating levels of FSH decrease rapidly. 
C)  Ovarian cells become less sensitive to FSH. 
D)  Testicular cells become less sensitive to LH and FSH. 
E)  Pituitary gland cells become more sensitive to GnRH.

Question 9

An allele that is ________ will be expressed only if it is present on both chromosomes of a homologous pair.

Accepted Answer

A)  dominant 
B)  recessive 
C)  incomplete 
D)  phenotypic 
E)  autosomal 
A)  dominant 
B)  recessive 
C)  incomplete 
D)  phenotypic 
E)  autosomal

Question 10

In simple inheritance,

Accepted Answer

A)  phenotypic characteristics are determined by a single pair of alleles. 
B)  phenotypic characteristics are determined by multiple alleles. 
C)  phenotypic characteristics are determined by the action of two genes. 
D)  phenotypic characteristics are controlled by regulator genes on a chromosome other than the one that has the structural genes. 
E)  phenotypic characteristics are determined by the genes on the Y chromosome. 
A)  phenotypic characteristics are determined by a single pair of alleles. 
B)  phenotypic characteristics are determined by multiple alleles. 
C)  phenotypic characteristics are determined by the action of two genes. 
D)  phenotypic characteristics are controlled by regulator genes on a chromosome other than the one that has the structural genes. 
E)  phenotypic characteristics are determined by the genes on the Y chromosome.

Question 11

Ova carry

Accepted Answer

A)  one X sex chromosome. 
B)  XX sex chromosomes. 
C)  YY sex chromosomes. 
D)  XO sex chromosomes. 
E)  one Y sex chromosome. 
A)  one X sex chromosome. 
B)  XX sex chromosomes. 
C)  YY sex chromosomes. 
D)  XO sex chromosomes. 
E)  one Y sex chromosome.

Question 12

The conversion of mammary glands from resting to active states requires the presence of both placental hormones and

Accepted Answer

A)  oxytocin and insulin. 
B)  progesterones and estrogens. 
C)  human chorionic gonadotropin and parathyroid hormones. 
D)  glucagon and somatostatin. 
E)  growth hormones, prolactin, and thyroid hormones. 
A)  oxytocin and insulin. 
B)  progesterones and estrogens. 
C)  human chorionic gonadotropin and parathyroid hormones. 
D)  glucagon and somatostatin. 
E)  growth hormones, prolactin, and thyroid hormones.

Question 13

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

The period of sexual and physical maturation is (the)

Accepted Answer

A)  infancy. 
B)  childhood. 
C)  senescence. 
D)  adolescence. 
E)  neonatal period. 
A)  infancy. 
B)  childhood. 
C)  senescence. 
D)  adolescence. 
E)  neonatal period.

Question 15

Regarding the growth spurt in girls in the United States, the growth rate is maximal between the ages of

Accepted Answer

A)  5-9 years. 
B)  9-11 years. 
C)  10-13 years. 
D)  14-15 years. 
E)  16-18 years. 
A)  5-9 years. 
B)  9-11 years. 
C)  10-13 years. 
D)  14-15 years. 
E)  16-18 years.

Question 16

Figure 20-1 Events in Implantation
Use Figure 20-1 to identify the labeled part.
-Label E 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 17

Polyspermy is

Accepted Answer

A)  when fertilization involves more than one sperm. 
B)  when multiple sperm release hyaluronidase concurrently. 
C)  the movement of millions of sperm through the female reproductive tract. 
D)  the clinical term for an adequate sperm count (more than 20 million per ejaculate). 
E)  the process that follows capacitation and enables sperm to bind to sperm receptors. 
A)  when fertilization involves more than one sperm. 
B)  when multiple sperm release hyaluronidase concurrently. 
C)  the movement of millions of sperm through the female reproductive tract. 
D)  the clinical term for an adequate sperm count (more than 20 million per ejaculate). 
E)  the process that follows capacitation and enables sperm to bind to sperm receptors.

Question 18

The ectoderm forms which of the following?

Accepted Answer

A)  muscle 
B)  all lymphatic structures 
C)  the cardiovascular system 
D)  the thymus, thyroid gland, and pancreas 
E)  all neural tissues 
A)  muscle 
B)  all lymphatic structures 
C)  the cardiovascular system 
D)  the thymus, thyroid gland, and pancreas 
E)  all neural tissues

Question 19

Which of the following is a hormone secreted by both the placenta and the corpus luteum during pregnancy and functions in suppressing the release of oxytocin?

Accepted Answer

A)  progesterone 
B)  human chorionic gonadotropin 
C)  relaxin 
D)  placental prolactin 
E)  estrogen 
A)  progesterone 
B)  human chorionic gonadotropin 
C)  relaxin 
D)  placental prolactin 
E)  estrogen

Question 20

The goal of labor is

Accepted Answer

A)  parturition. 
B)  fertilization. 
C)  gastrulation. 
D)  cleavage. 
E)  placentation. 
A)  parturition. 
B)  fertilization. 
C)  gastrulation. 
D)  cleavage. 
E)  placentation.

During implantation,

Which process begins as the surface of the blastocyst next to the inner cell mass adheres to the uterine lining?

The extraembryonic membrane that contains fluid that surrounds and cushions the developing embryo and fetus is known as the

Which of the following is an autosomal dominant inherited disorder?

The most common viable chromosome abnormality is

Which of the following forms when blood vessels form in the chorion, around the periphery of the blastocyst?

A(n) ________ allele will always be expressed regardless of what the other allele happens to be.

Which of the following is a major hormonal event at the onset of puberty?

An allele that is ________ will be expressed only if it is present on both chromosomes of a homologous pair.

In simple inheritance,

Ova carry

The conversion of mammary glands from resting to active states requires the presence of both placental hormones and

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

The period of sexual and physical maturation is (the)

Regarding the growth spurt in girls in the United States, the growth rate is maximal between the ages of

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

Polyspermy is

The ectoderm forms which of the following?

Which of the following is a hormone secreted by both the placenta and the corpus luteum during pregnancy and functions in suppressing the release of oxytocin?

The goal of labor is

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

During implantation,

Which process begins as the surface of the blastocyst next to the inner cell mass adheres to the uterine lining?

The extraembryonic membrane that contains fluid that surrounds and cushions the developing embryo and fetus is known as the

Which of the following is an autosomal dominant inherited disorder?

The most common viable chromosome abnormality is

Which of the following forms when blood vessels form in the chorion, around the periphery of the blastocyst?

A(n) ________ allele will always be expressed regardless of what the other allele happens to be.

Which of the following is a major hormonal event at the onset of puberty?

An allele that is ________ will be expressed only if it is present on both chromosomes of a homologous pair.

In simple inheritance,

Ova carry

The conversion of mammary glands from resting to active states requires the presence of both placental hormones and

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

The period of sexual and physical maturation is (the)

Regarding the growth spurt in girls in the United States, the growth rate is maximal between the ages of

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

Polyspermy is

The ectoderm forms which of the following?

Which of the following is a hormone secreted by both the placenta and the corpus luteum during pregnancy and functions in suppressing the release of oxytocin?

The goal of labor is

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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