Question 1

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 2

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 3

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 4

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 5

"Induced" abortions

Accepted Answer

A) happen due to physiological problems. 
B) are called "miscarriages." 
C) are performed when continuing a pregnancy represents a threat to the life and health of the mother. 
D) occur due to developmental problems. 
E) are performed at the woman's request. 
A) happen due to physiological problems. 
B) are called "miscarriages." 
C) are performed when continuing a pregnancy represents a threat to the life and health of the mother. 
D) occur due to developmental problems. 
E) are performed at the woman's request.

Question 6

In which of the following does the individual carry the sex chromosome pattern XXY and is a male?

Accepted Answer

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

Question 7

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 8

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 9

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 10

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 11

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 12

If an X-carrying sperm fertilizes an egg, the resulting zygote will be

Accepted Answer

A) either male or female. 
B) male only. 
C) female only. 
D) nonviable. 
E) both male and female. 
A) either male or female. 
B) male only. 
C) female only. 
D) nonviable. 
E) both male and female.

Question 13

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 14

Genes that appear on the X chromosome are said to be

Accepted Answer

A) X-linked. 
B) autosomal recessive. 
C) heterozygous. 
D) homologous. 
E) lethal. 
A) X-linked. 
B) autosomal recessive. 
C) heterozygous. 
D) homologous. 
E) lethal.

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

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

Question 17

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 18

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 19

The normal pair of sex chromosomes in males is

Accepted Answer

A) XX. 
B) XO. 
C) YO. 
D) XY. 
E) YY. 
A) XX. 
B) XO. 
C) YO. 
D) XY. 
E) YY.

Question 20

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

Hemophilia is a(n)

Which of the following is a recessive trait?

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

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

"Induced" abortions

In which of the following does the individual carry the sex chromosome pattern XXY and is a male?

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,

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

A blastocyst is

If an X-carrying sperm fertilizes an egg, the resulting zygote will be

The goal of labor is

Genes that appear on the X chromosome are said to be

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

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

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

In simple inheritance,

The normal pair of sex chromosomes in males is

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

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

Exam 20: Development and Inheritance

Hemophilia is a(n)

Which of the following is a recessive trait?

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

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

"Induced" abortions

In which of the following does the individual carry the sex chromosome pattern XXY and is a male?

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,

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

A blastocyst is

If an X-carrying sperm fertilizes an egg, the resulting zygote will be

The goal of labor is

Genes that appear on the X chromosome are said to be

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

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

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

In simple inheritance,

The normal pair of sex chromosomes in males is

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

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