Question 1

What extends from the embryo into the endometrium, contributing to the formation of the placenta?

Accepted Answer

A)   Chorionic villi
B)   Embryonic disc and trophoblast
C)   Yolk sac and allantois
D)   Mesoderm and endoderm

Question 2

What sex chromosomes are found in normal male cells?

Accepted Answer

A)   One X and one Y chromosome
B)   Two X chromosomes
C)   Two Y chromosomes
D)   Two X and two Y chromosomes

Question 3

What is the role of the hormone oxytocin in the birth process?

Accepted Answer

A)   It stimulates thickening of the uterine lining.
B)   It stimulates uterine-wall contractions.
C)   It stimulates an increase in progesterone secretion.
D)   It stimulates an increase in estrogen secretion. B

Question 4

What primary germ layer gives rise to the muscles and bones?

Accepted Answer

A)   Mesoderm
B)   Endoderm
C)   Ectoderm

Question 5

How many major blood vessels are typically found in the umbilical cord?

Accepted Answer

A)   One artery and one vein
B)   Two arteries and one vein
C)   One artery and two veins
D)   Two arteries and two veins

Question 6

The ductus arteriosus allows fetal blood to bypass the liver.

Accepted Answer

A) True 
 B)False

Question 7

A sperm cell needs to pass through several layers/structures in order to fertilize a secondary oocyte. What is the correct order of these layers?

Accepted Answer

A)   Corona radiata → zona pellucida → oocyte cell membrane
B)   Zona pellucida → oocyte cell membrane → corona radiata
C)   Oocyte cell membrane → zona pellucida → corona radiata
D)   Zona pellucida → corona radiata → oocyte cell membrane A

Question 8

Immediately following birth, the newborn's metabolic rate __________, and its oxygen consumption __________.

Accepted Answer

A)   increases; increases
B)   increases; decreases
C)   decreases; increases
D)   decreases; decreases

Question 9

Development includes growth and is a continuous process during which the individual changes from one life phase to another.

Accepted Answer

A) True 
 B)False

Question 10

What is the probability that a man with a straight hairline (genotype ww)  and a woman with a widow's peak (genotype Ww)  will have a child with a straight hairline?

Accepted Answer

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

Question 11

Factors that can cause malformations by affecting an embryo during its period of rapid growth and development are called teratogens.

Accepted Answer

A) True 
 B)False

Question 12

When a sperm cell fertilizes an egg cell, a(n) __________ is formed.

Accepted Answer

The answer of When a sperm cell fertilizes an egg...

Question 13

Each cell of a human zygote contains ___________ chromosomes.

Accepted Answer

The answer of Each cell of a human zygote contains...

Question 14

The external reproductive organs can be distinguished by the __________ week of development.

Accepted Answer

A)   eighth
B)   twelfth
C)   fifteenth
D)   twentieth B

Question 15

Where does fertilization normally occur?

Accepted Answer

A)   In the uterine tube
B)   In the uterus
C)   In the vagina
D)   In the ovary

Question 16

The hormone __________ suppresses uterine contractions while __________ promotes uterine contractions.

Accepted Answer

A)   progesterone; prostaglandin
B)   follicle-stimulating hormone (FSH) ; luteininzing hormone (LH) 
C)   estrogen; progesterone
D)   oxytocin; estrogen

Question 17

What is the probability for the possible genotypes that result from the cross of two heterozygous parents?

Accepted Answer

A)   25% AA; 50% Aa; 25% aa
B)   100% Aa
C)   75% AA; 25% aa
D)   50% Aa; 50% aa

Question 18

When does the fetal stage of development begin?

Accepted Answer

A)   At the end of the fourth week of pregnancy
B)   At the end of the eighth week of pregnancy
C)   At the end of the tenth week of pregnancy
D)   At the end of the twelfth week of pregnancy

Question 19

During early prenatal development, a hollowed-out ball of cells called the __________ forms, which will attach to the endometrium.

Accepted Answer

A)   blastocyst
B)   morula
C)   zygote
D)   fetus

Question 20

Within a blastocyst, the __________ becomes the embryo proper, and the __________ is involved in anchoring the blastocyst to the uterine lining.

Accepted Answer

A)   inner cell mass; trophoblast
B)   chorion; allantois
C)   trophoblast; placenta
D)   morula; gastrula

Exam 20: Pregnancy, Growth, Development, and Genetics

What extends from the embryo into the endometrium, contributing to the formation of the placenta?

Correct AnswerverifiedShow Answer

What sex chromosomes are found in normal male cells?

Correct AnswerverifiedShow Answer

What is the role of the hormone oxytocin in the birth process?

Correct AnswerverifiedB

What primary germ layer gives rise to the muscles and bones?

Correct AnswerverifiedShow Answer

How many major blood vessels are typically found in the umbilical cord?

Correct AnswerverifiedShow Answer

The ductus arteriosus allows fetal blood to bypass the liver.

Correct AnswerverifiedShow Answer

A sperm cell needs to pass through several layers/structures in order to fertilize a secondary oocyte. What is the correct order of these layers?

Correct AnswerverifiedA

Immediately following birth, the newborn's metabolic rate __________, and its oxygen consumption __________.

Correct AnswerverifiedShow Answer

Development includes growth and is a continuous process during which the individual changes from one life phase to another.

Correct AnswerverifiedShow Answer

What is the probability that a man with a straight hairline (genotype ww) and a woman with a widow's peak (genotype Ww) will have a child with a straight hairline?

Correct AnswerverifiedShow Answer

Factors that can cause malformations by affecting an embryo during its period of rapid growth and development are called teratogens.

Correct AnswerverifiedShow Answer

When a sperm cell fertilizes an egg cell, a(n) __________ is formed.

Correct AnswerverifiedShow Answer

Each cell of a human zygote contains ___________ chromosomes.

Correct AnswerverifiedShow Answer

The external reproductive organs can be distinguished by the __________ week of development.

Correct AnswerverifiedB

Where does fertilization normally occur?

Correct AnswerverifiedShow Answer

The hormone __________ suppresses uterine contractions while __________ promotes uterine contractions.

Correct AnswerverifiedShow Answer

What is the probability for the possible genotypes that result from the cross of two heterozygous parents?

Correct AnswerverifiedShow Answer

When does the fetal stage of development begin?

Correct AnswerverifiedShow Answer

During early prenatal development, a hollowed-out ball of cells called the __________ forms, which will attach to the endometrium.

Correct AnswerverifiedShow Answer

Within a blastocyst, the __________ becomes the embryo proper, and the __________ is involved in anchoring the blastocyst to the uterine lining.

Correct AnswerverifiedShow Answer

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B

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A

Immediately following birth, the newborn's metabolic rate , and its oxygen consumption .

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B

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The hormone suppresses uterine contractions while promotes uterine contractions.

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Within a blastocyst, the becomes the embryo proper, and the is involved in anchoring the blastocyst to the uterine lining.

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