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Challenge Yourself
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1
Fertilization of the secondary oocyte normally occurs in the
A)ovary.
B)uterine tube.
C)uterus.
D)vagina.
2
The outer layer of the blastocyst that attaches to the wall of the uterus at implantation is called the
A)amnion.
B)yolk sac.
C)embryoblast.
D)trophoblast.
3
At about day 3 after fertilization, the cells of the preembryo adhere tightly to each other and increase their surface contact in a process called
A)implantation.
B)compaction.
C)gastrulation.
D)neurulation.
4
Somites develop from
A)paraxial mesoderm.
B)intermediate mesoderm.
C)lateral plate mesoderm.
D)head mesenchyme.
5
During gastrulation, cells from the ________ layer of the bilaminar germinal disc migrate and form the three primary germ layers.
A)notochord
B)hypoblast
C)epiblast
D)mesoblast
6
An abnormal number of chromosomes in a cell following meiosis occurs as a result of
A)synapsis.
B)nondisjunction.
C)crossing over.
D)reduction division.
7
The cells of the embryoblast differentiate into the ________ and the ________.
A)epiblast, hypoblast
B)cytotrophoblast, syncytiotrophoblast
C)amnioblast, epiblast
D)epiblast, cytotrophoblast
8
Which of the following is not an extraembryonic membrane?
A)amnion
B)mesoderm
C)chorion
D)yolk sac
9
Capacitation occurs when sperm cells
A)move through the uterine tubes.
B)are mixed with secretions from the testes.
C)are deposited within the female reproductive tract.
D)are preparing to penetrate the secondary oocyte.
10
The beginning of brain and spinal cord formation is termed
A)nodal invagination.
B)organogenesis.
C)neurulation.
D)gastrulation.







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