Question 1

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. A

Question 2

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. A

Question 3

What follows immediately after fertilization occurs?

Accepted Answer

A)   acrosomal reaction
B)   cleavage
C)   sperm migration
D)   capacitation

Question 4

What are the maternal and fetal contributions to the placenta?

Accepted Answer

The fetal portion of the place...

Question 5

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 6

Inherited traits controlled by two or more genes are called:

Accepted Answer

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

Question 7

Explain the role of oxytocin in lactation.

Accepted Answer

Oxytocin is responsible for the actual e...

Question 8

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 4

Question 9

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

Accepted Answer

A)   trophoblast
B)   hypoblast
C)   inner cell mass
D)   epiblast

Question 10

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 11

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 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 period

Question 13

During which stage of labor does the fetal head crown?

Accepted Answer

A)   placental
B)   effacement
C)   dilation
D)   expulsion

Question 14

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 15

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.

Question 16

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

Accepted Answer

A)   organogenesis
B)   formation of the placenta
C)   gastrulation
D)   implantation

Question 17

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. B

Question 18

The initial stimulus for labor comes from the:

Accepted Answer

A)   fetus.
B)   maternal hypothalamus.
C)   maternal ovaries.
D)   maternal uterus.

Question 19

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 progesterone

Question 20

Dilation is the longest of the three stages of labor.

Accepted Answer

A) True 
 B)False

Exam 27: Development Heredity

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

Correct AnswerverifiedA

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

Correct AnswerverifiedA

What follows immediately after fertilization occurs?

Correct AnswerverifiedShow Answer

What are the maternal and fetal contributions to the placenta?

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

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

Correct AnswerverifiedShow Answer

Inherited traits controlled by two or more genes are called:

Correct AnswerverifiedShow Answer

Explain the role of oxytocin in lactation.

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

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

Correct AnswerverifiedShow Answer

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

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

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

During which stage of labor does the fetal head crown?

Correct AnswerverifiedShow 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

Labor progresses through the following three stages:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedB

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

Dilation is the longest of the three stages of labor.

Correct AnswerverifiedShow Answer

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A

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The fetal portion of the place...
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Oxytocin is responsible for the actual e...
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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:

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B

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