Question 1

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 2

Choose the correct statement about amphimixis.

Accepted Answer

A)  a process that results in a zygote 
B)  a genetic disorder based on autosomal dominance 
C)  the transition from morula to blastocyst 
D)  the time during which sperm travel toward the ovum 
E)  the formation of the male and female pronuclei 
A)  a process that results in a zygote 
B)  a genetic disorder based on autosomal dominance 
C)  the transition from morula to blastocyst 
D)  the time during which sperm travel toward the ovum 
E)  the formation of the male and female pronuclei

Question 3

Regarding X-linked traits,if a father with normal color vision has children with a heterozygous mother,what percentage of the daughters will have normal color vision?

Accepted Answer

A)  0% 
B)  25% 
C)  50% 
D)  75% 
E)  100% 
A)  0% 
B)  25% 
C)  50% 
D)  75% 
E)  100%

Question 4

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 5

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 6

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 7

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.

Question 8

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 9

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 10

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

Question 11

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 12

Which statement regarding placental circulation is true?

Accepted Answer

A)  Oxygenated maternal blood re-enters the mother's venous system through chorionic villi. 
B)  Maternal and fetal blood mix near the placenta. 
C)  Deoxygenated maternal blood re-enters the mother's venous system through small uterine veins. 
D)  Deoxygenated blood leaves the chorionic villi through umbilical arteries. 
E)  Oxygenated fetal blood enters the chorionic villi through umbilical arteries. 
A)  Oxygenated maternal blood re-enters the mother's venous system through chorionic villi. 
B)  Maternal and fetal blood mix near the placenta. 
C)  Deoxygenated maternal blood re-enters the mother's venous system through small uterine veins. 
D)  Deoxygenated blood leaves the chorionic villi through umbilical arteries. 
E)  Oxygenated fetal blood enters the chorionic villi through umbilical arteries.

Question 13

Separation of the inner cell mass from the trophoblast forms the

Accepted Answer

A)  blastocoele. 
B)  lacunae. 
C)  amniotic cavity. 
D)  chorion. 
E)  allantois. 
A)  blastocoele. 
B)  lacunae. 
C)  amniotic cavity. 
D)  chorion. 
E)  allantois.

Question 14

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 15

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 16

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

Question 17

Which of the following is an example of positive feedback during labor?

Accepted Answer

A)  the movement of the fetus toward the cervical canal 
B)  the pressure the unborn exerts on the cervix 
C)  the distortion of the myometrium stimulates oxytocin release 
D)  the dilation of the cervix followed by the rupture of the amnion 
E)  the ejection of the placenta at the end of the placental stage 
A)  the movement of the fetus toward the cervical canal 
B)  the pressure the unborn exerts on the cervix 
C)  the distortion of the myometrium stimulates oxytocin release 
D)  the dilation of the cervix followed by the rupture of the amnion 
E)  the ejection of the placenta at the end of the placental stage

Question 18

The last stage of labor is the

Accepted Answer

A)  dilation stage. 
B)  expulsion stage. 
C)  placental stage. 
D)  decidual stage. 
E)  neonate stage. 
A)  dilation stage. 
B)  expulsion stage. 
C)  placental stage. 
D)  decidual stage. 
E)  neonate stage.

Question 19

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 20

Which statement is true regarding conjoined twins?

Accepted Answer

A)  Splitting of the inner cell mass may have occurred before gastrulation. 
B)  Surgical separation is nearly impossible even with minor fusion. 
C)  Separation of the blastomeres early in cleavage may have occurred. 
D)  Splitting of the blastomeres or of the embryonic disc is not complete. 
E)  Two separate oocytes are fertilized at the same time. 
A)  Splitting of the inner cell mass may have occurred before gastrulation. 
B)  Surgical separation is nearly impossible even with minor fusion. 
C)  Separation of the blastomeres early in cleavage may have occurred. 
D)  Splitting of the blastomeres or of the embryonic disc is not complete. 
E)  Two separate oocytes are fertilized at the same time.

The extraembryonic membrane that forms the urinary bladder is the

Choose the correct statement about amphimixis.

Regarding X-linked traits,if a father with normal color vision has children with a heterozygous mother,what percentage of the daughters will have normal color vision?

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

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 E represents which of the following structures?

The goal of labor is

The most common viable chromosome abnormality is

The morula stage occurs during which process?

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

Paired chromosomes are called

Which statement regarding placental circulation is true?

Separation of the inner cell mass from the trophoblast forms the

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?

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

Match the gestational age with the corresponding prenatal development.

Which of the following is an example of positive feedback during labor?

The last stage of labor is the

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

Which statement is true regarding conjoined twins?

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

The extraembryonic membrane that forms the urinary bladder is the

Choose the correct statement about amphimixis.

Regarding X-linked traits,if a father with normal color vision has children with a heterozygous mother,what percentage of the daughters will have normal color vision?

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

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 E represents which of the following structures?

The goal of labor is

The most common viable chromosome abnormality is

The morula stage occurs during which process?

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

Paired chromosomes are called

Which statement regarding placental circulation is true?

Separation of the inner cell mass from the trophoblast forms the

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?

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

Match the gestational age with the corresponding prenatal development.

Which of the following is an example of positive feedback during labor?

The last stage of labor is the

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

Which statement is true regarding conjoined twins?

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