Question 1

During which stage of labor does the fetal head crown?

Accepted Answer

A)   placental
B)   effacement
C)   dilation
D)   expulsionE) C) and D)
F) A) and D)

Question 2

Dilation is the longest of the three stages of labor.

Accepted Answer

A) True 
 B)False

Question 3

The four extraembryonic membranes that arise from the bilaminar embryonic disc are the chorion, amnion, allantois, and yolk sac.

Accepted Answer

A) True 
 B)False

Question 4

Explain the role of oxytocin in lactation.

Accepted Answer

Oxytocin is responsible for the actual e...

Question 5

The rearrangement and migration of the cells of the bilaminar embryonic disc forms the trilaminar embryonic disc in a process called:

Accepted Answer

A)   gastrulation.
B)   formation of the blastula.
C)   organogenesis.
D)   fertilization.E) A) and B)
F) A) and D) A

Question 6

Which of the following does NOT occur during the embryonic period?

Accepted Answer

A)   organogenesis
B)   formation of the placenta
C)   gastrulation
D)   implantationE) B) and D)
F) A) and D)

Question 7

The initial stimulus for labor comes from the:

Accepted Answer

A)   fetus.
B)   maternal hypothalamus.
C)   maternal ovaries.
D)   maternal uterus.E) A) and C)
F) None of the above

Question 8

Which hormones stimulate the growth of alveoli in the mother's mammary gland?

Accepted Answer

A)   estrogen and prolactin
B)   oxytocin and progesterone
C)   prolactin and cortisol
D)   estrogen and progesteroneE) A) and B)
F) All of the above

Question 9

Predict the possible genotypes of offspring of a couple who both are heterozygous for free earlobes. The trait for free earlobes are carried on the dominant allele while the trait for attached earlobes is carried on the recessive allele.

Accepted Answer

The dominant allele, E, is for the free ...

Question 10

Anencephaly, a fatal condition, results from the failure of the anterior end of the neural tube to close
properly, causing failure of the forebrain to develop. Determine and discuss the germ layer involved in this defect.

Accepted Answer

Failure of the forebrain to develop resu...

Question 11

In order for a male to inherit a sex -linked (X -linked)  disorder, he must receive the allele from:

Accepted Answer

A)   either his mother or father.
B)   his mother only.
C)   his father only.
D)   both his mother and father.E) All of the above
F) B) and D) B

Question 12

By which period of prenatal development will the placenta be fully formed?

Accepted Answer

A)   embryonic period
B)   pre -embryonic period
C)   infancy
D)   fetal periodE) A) and C)
F) B) and C)

Question 13

During which month of prenatal development will the fetus begin to develop reflexes?

Accepted Answer

A)   month 2
B)   month 8
C)   month 6
D)   month 4E) B) and C)
F) A) and D)

Question 14

If two alleles code for the same trait (such as blond hair) , they are said to be:

Accepted Answer

A)   homozygous.
B)   homologous.
C)   heterozygous.
D)   autologous.E) All of the above
F) A) and B) A

Question 15

Which part of the embryo contributes to the fetal portion of the placenta?

Accepted Answer

A)   trophoblast
B)   hypoblast
C)   inner cell mass
D)   epiblastE) C) and D)
F) A) and D)

Question 16

What follows immediately after fertilization occurs?

Accepted Answer

A)   acrosomal reaction
B)   cleavage
C)   sperm migration
D)   capacitationE) All of the above
F) A) and B)

Question 17

Inherited traits controlled by two or more genes are called:

Accepted Answer

A)   incomplete dominance.
B)   multiple alleles.
C)   polygenic inheritance.
D)   codominance.E) A) and B)
F) A) and C)

Question 18

What are the maternal and fetal contributions to the placenta?

Accepted Answer

The fetal portion of the place...

Question 19

The ductus arteriosus is a fetal vascular shunt that allows blood to flow from the pulmonary trunk directly into the aorta.

Accepted Answer

A) True 
 B)False

Question 20

Labor progresses through the following three stages:

Accepted Answer

A)   duration, expansion, and placental stages.
B)   dilation, effacing, and placental stages.
C)   dilation, expulsion, and placental stages.
D)   dilation, expansion, and pushing stages.E) C) and D)
F) A) and B)

Exam 27: Development Heredity

During which stage of labor does the fetal head crown?

Correct AnswerverifiedShow Answer

Dilation is the longest of the three stages of labor.

Correct AnswerverifiedShow Answer

The four extraembryonic membranes that arise from the bilaminar embryonic disc are the chorion, amnion, allantois, and yolk sac.

Correct AnswerverifiedShow Answer

Explain the role of oxytocin in lactation.

Correct AnswerverifiedOxytocin is responsible for the actual e...View AnswerShow Answer

The rearrangement and migration of the cells of the bilaminar embryonic disc forms the trilaminar embryonic disc in a process called:

Correct AnswerverifiedA

Which of the following does NOT occur during the embryonic period?

Correct AnswerverifiedShow Answer

The initial stimulus for labor comes from the:

Correct AnswerverifiedShow Answer

Which hormones stimulate the growth of alveoli in the mother's mammary gland?

Correct AnswerverifiedShow Answer

Predict the possible genotypes of offspring of a couple who both are heterozygous for free earlobes. The trait for free earlobes are carried on the dominant allele while the trait for attached earlobes is carried on the recessive allele.

Correct AnswerverifiedThe dominant allele, E, is for the free ...View AnswerShow Answer

Anencephaly, a fatal condition, results from the failure of the anterior end of the neural tube to close properly, causing failure of the forebrain to develop. Determine and discuss the germ layer involved in this defect.

Correct AnswerverifiedFailure of the forebrain to develop resu...View AnswerShow Answer

In order for a male to inherit a sex -linked (X -linked) disorder, he must receive the allele from:

Correct AnswerverifiedB

By which period of prenatal development will the placenta be fully formed?

Correct AnswerverifiedShow Answer

During which month of prenatal development will the fetus begin to develop reflexes?

Correct AnswerverifiedShow Answer

If two alleles code for the same trait (such as blond hair) , they are said to be:

Correct AnswerverifiedA

Which part of the embryo contributes to the fetal portion of the placenta?

Correct AnswerverifiedShow Answer

What follows immediately after fertilization occurs?

Correct AnswerverifiedShow Answer

Inherited traits controlled by two or more genes are called:

Correct AnswerverifiedShow Answer

What are the maternal and fetal contributions to the placenta?

Correct AnswerverifiedThe fetal portion of the place...View AnswerShow Answer

The ductus arteriosus is a fetal vascular shunt that allows blood to flow from the pulmonary trunk directly into the aorta.

Correct AnswerverifiedShow Answer

Labor progresses through the following three stages:

Correct AnswerverifiedShow Answer

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Oxytocin is responsible for the actual e...
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A

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The dominant allele, E, is for the free ...
View Answer

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Failure of the forebrain to develop resu...
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In order for a male to inherit a sex ^-linked (X ^-linked) disorder, he must receive the allele from:

Correct Answer
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B

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A

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The fetal portion of the place...
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