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

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 4

What follows immediately after fertilization occurs?

Accepted Answer

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

Question 5

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 6

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 answer of Predict the possible genotypes of offspring of...

Question 7

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 8

Inherited traits controlled by two or more genes are called:

Accepted Answer

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

Question 9

Explain the role of oxytocin in lactation.

Accepted Answer

The answer of Explain the role of oxytocin in lactation....

Question 10

What are the maternal and fetal contributions to the placenta?

Accepted Answer

The answer of What are the maternal and fetal contributions...

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

The initial stimulus for labor comes from the:

Accepted Answer

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

Question 13

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 14

During which stage of labor does the fetal head crown?

Accepted Answer

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

Question 15

Dilation is the longest of the three stages of labor.

Accepted Answer

A) True 
 B)False

Question 16

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 17

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 18

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 19

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

The answer of Anencephaly, a fatal condition, results from the...

Question 20

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

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:

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

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

What follows immediately after fertilization occurs?

Labor progresses through the following three stages:

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.

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

Inherited traits controlled by two or more genes are called:

Explain the role of oxytocin in lactation.

What are the maternal and fetal contributions to the placenta?

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

The initial stimulus for labor comes from the:

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

During which stage of labor does the fetal head crown?

Dilation is the longest of the three stages of labor.

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

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

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

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.

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