Question 1

Which germ layer is most muscle derived from?

Accepted Answer

A)  ectoderm
B)  mesoderm
C)  endodermD) B) and C)
E) A) and C)

Question 2

Which germ layer is the thymus derived from?

Accepted Answer

A)  ectoderm
B)  mesoderm
C)  endodermD) None of the above
E) All of the above

Question 3

Genes on the X chromosomes are

Accepted Answer

A)  polygenic.
B)  X-linked.
C)  simple.
D)  holandric.
E)  Y-linked.F) C) and E)
G) B) and E)

Question 4

Which germ layer are the tonsils derived from?

Accepted Answer

A)  ectoderm
B)  mesoderm
C)  endodermD) A) and B)
E) A) and C)

Question 5

What term means that both alleles are the same?

Accepted Answer

A)  locus
B)  alleles
C)  homozygous
D)  heterozygous
E)  karyotypeF) C) and D)
G) B) and C)

Question 6

Which of the following conditions might result in stress on a fetus that has nearly completed 9 months of fetal development?

Accepted Answer

A)  placental growth greater than fetal growth
B)  cramped quarters in the uterus
C)  increased O2 supply to the fetus
D)  excessive weight gain by the mother
E)  hormone fluctuationsF) B) and D)
G) B) and C)

Question 7

A mistake during segregation of chromosomes is called

Accepted Answer

A)  deletion.
B)  duplication.
C)  nondisjunction.
D)  point mutation.
E)  aneuploidyF) A) and E)
G) D) and E)

Question 8

The embryo is most sensitive to outside influences that can cause malformations during the

Accepted Answer

A)  first two weeks after fertilization.
B)  third to the ninth weeks of development.
C)  ninth to the sixteenth weeks of development.
D)  twelfth to the twentieth weeks of development.
E)  twenty-first to twenty-sixth week of development.F) None of the above
G) A) and D)

Question 9

The central cavity of the neural tube becomes the

Accepted Answer

A)  cerebrum.
B)  mid-brain.
C)  cranial cavity.
D)  ventricles of the brain.
E)  epidural space.F) A) and E)
G) C) and D)

Question 10

A non-albino female who is a carrier for the albino allele (Aa) ,mates with an albino (aa) male.What is the probability that their children will be albino?

Accepted Answer

A)  0%
B)  25%
C)  50%
D)  75%
E)  100%F) A) and E)
G) A) and C)

Question 11

What genetic disorder is the inability to produce normal hemoglobin?

Accepted Answer

A)  albinism
B)  sickle-cell disease
C)  hemophilia
D)  Down syndrome
E)  achondroplasiaF) A) and C)
G) B) and D)

Question 12

Cells of the neuroectoderm become all of the following EXCEPT the

Accepted Answer

A)  brain
B)  spinal cord
C)  postganglionic autonomic neurons
D)  posterior pituitary glandE) B) and C)
F) B) and D)

Question 13

Segments of mesoderm that will form muscles are

Accepted Answer

A)  mesonephros.
B)  mandibular processes.
C)  neural tube.
D)  secondary palate.
E)  somites.F) A) and D)
G) C) and D)

Question 14

When stretch receptors in the cervix are stimulated by the continually increasing pressure of the fetus,afferent neurons send impulses to the maternal hypothalamus resulting in

Accepted Answer

A)  increased estrogen production.
B)  increased oxytocin production.
C)  increased fetal CRH production.
D)  increased growth in the size of the placenta.
E)  decreased oxytocin production.F) A) and E)
G) B) and C)

Question 15

The olfactory bulbs and nerves develop as an evagination from the

Accepted Answer

A)  myelencephalon.
B)  mesencephalon.
C)  neural crest cells.
D)  diencephalon.
E)  telencephalon.F) A) and B)
G) C) and D)

Question 16

Fusion of the male and female pronuclei forms the

Accepted Answer

A)  blastocyst.
B)  morula.
C)  zygote.
D)  gastrula.
E)  trophoblast.F) B) and C)
G) C) and E)

Question 17

Onset of labor may result from

Accepted Answer

A)  increased estrogen secretion by the placenta.
B)  increased glucocorticoid secretion by the mother.
C)  increased secretion of oxytocin by the fetus.
D)  increased progesterone secretion by the placenta.
E)  decreased prostaglandins.F) A) and B)
G) C) and D)

Question 18

The common junction of the digestive,urinary,and genital systems is the

Accepted Answer

A)  cloaca.
B)  coelom.
C)  allantois.
D)  hindgut.
E)  anus.F) A) and B)
G) A) and D)

Question 19

Placenta previa occurs when

Accepted Answer

A)  a normally placed placenta tears away from the uterine wall.
B)  the placenta is formed too early.
C)  implantation occurs close to the cervix.
D)  implantation occurs in the fundus of the uterus.E) None of the above
F) All of the above

Question 20

Which gland develops from an evagination of the ectoderm in the roof of the embryonic oral cavity?

Accepted Answer

A)  anterior pituitary gland
B)  posterior pituitary gland
C)  thyroid gland
D)  adrenal glands
E)  pancreasF) A) and E)
G) A) and D)

Exam 29: Development,growth,aging,and Genetics

Which of the following conditions might result in stress on a fetus that has nearly completed 9 months of fetal development?

Correct AnswerverifiedShow Answer

A mistake during segregation of chromosomes is called

Correct AnswerverifiedShow Answer

Which germ layer is most muscle derived from?

Correct AnswerverifiedShow Answer

The common junction of the digestive,urinary,and genital systems is the

Correct AnswerverifiedShow Answer

The central cavity of the neural tube becomes the

Correct AnswerverifiedShow Answer

Placenta previa occurs when

Correct AnswerverifiedShow Answer

Fusion of the male and female pronuclei forms the

Correct AnswerverifiedShow Answer

The embryo is most sensitive to outside influences that can cause malformations during the

Correct AnswerverifiedShow Answer

The olfactory bulbs and nerves develop as an evagination from the

Correct AnswerverifiedShow Answer

A non-albino female who is a carrier for the albino allele (Aa) ,mates with an albino (aa) male.What is the probability that their children will be albino?

Correct AnswerverifiedShow Answer

Which germ layer is the thymus derived from?

Correct AnswerverifiedShow Answer

Segments of mesoderm that will form muscles are

Correct AnswerverifiedShow Answer

When stretch receptors in the cervix are stimulated by the continually increasing pressure of the fetus,afferent neurons send impulses to the maternal hypothalamus resulting in

Correct AnswerverifiedShow Answer

Cells of the neuroectoderm become all of the following EXCEPT the

Correct AnswerverifiedShow Answer

Genes on the X chromosomes are

Correct AnswerverifiedShow Answer

What genetic disorder is the inability to produce normal hemoglobin?

Correct AnswerverifiedShow Answer

Which germ layer are the tonsils derived from?

Correct AnswerverifiedShow Answer

What term means that both alleles are the same?

Correct AnswerverifiedShow Answer

Which gland develops from an evagination of the ectoderm in the roof of the embryonic oral cavity?

Correct AnswerverifiedShow Answer

Onset of labor may result from

Correct AnswerverifiedShow Answer

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