Question 1

Which of the following is a neural tube defect that involves incomplete development of the brain and results in stillbirth or death shortly after birth?

Accepted Answer

A)  spina bifida 
B)  neurulation 
C)  anencephaly 
D)  morphogenesis

Question 2

Primordial germ cells can be found in the ________ of the developing female embryo.

Accepted Answer

A)  yolk sac 
B)  chorion 
C)  allantois 
D)  placenta

Question 3

Which of the following is false concerning fertilization?

Accepted Answer

A)  Several sperm must contribute their DNA to the egg. 
B)  Enzymes are released from the acrosome of the sperm to penetrate the egg. 
C)  Most sperm die on their way to the egg. 
D)  The process can take hours to complete.

Question 4

During the pre-embryonic period, a single sperm passes through the zona pellucida. In the vast majority of cases, where does this process occur?

Accepted Answer

A)  in the uterus 
B)  in the ovary 
C)  in the oviduct (fallopian tube) 
D)  in the placenta

Question 5

A significant percentage of pre-embryos fail to continue their development or to implant in the uterus. Explain what may happen to prevent development from continuing.

Accepted Answer

The answer of A significant percentage of pre-embryos fail to...

Question 6

Normally, fertilization occurs in the ________, and implantation occurs in the ________.

Accepted Answer

A)  vagina; uterus 
B)  uterus; ovary 
C)  oviduct (fallopian tube); uterus 
D)  ovary; oviduct (fallopian tube)

Question 7

The period that begins at week 9 of development is the ________.

Accepted Answer

The answer of The period that begins at week 9...

Question 8

Explain how a pregnancy test works. Make sure to indicate the hormone that the test detects and the role that hormone plays during early pregnancy.

Accepted Answer

The answer of Explain how a pregnancy test works. Make...

Question 9

The central nervous system develops from the same area from which this is derived.

Accepted Answer

A)  muscles 
B)  digestive system 
C)  skin 
D)  blood cells

Question 10

A condition in which the placenta forms in the lower half of the uterus and covers the cervix, which may result in premature birth or maternal hemorrhage, is called ________.

Accepted Answer

A)  cesarean section 
B)  neural tube 
C)  colostrum 
D)  placenta previa

Question 11

A male has a genetic disease coded for on his Y chromosome. This disease has been seen in his family in past generations. Which parent passed on this trait?

Accepted Answer

A)  the mom 
B)  the dad 
C)  either the mom or dad 
D)  neither parent - it is a spontaneous mutation

Question 12

Which of the following is a germ layer that forms the lining of the urinary, respiratory, and digestive tracts?

Accepted Answer

A)  ectoderm 
B)  endoderm 
C)  mesoderm 
D)  embryonic disk

Question 13

The blastocyst attaches to the ________ about 6 days after fertilization and begins to digest its way inward.

Accepted Answer

The answer of The blastocyst attaches to the ________ about...

Question 14

Both the nucleus in the head of the sperm and the mitochondria in the midpiece of the sperm include genetic information (DNA) about the father. The offspring, however, contains only nuclear DNA from the father but both mitochondrial and nuclear DNA from the mother. Why does the newborn lack the father's mitochondrial DNA?

Accepted Answer

The answer of Both the nucleus in the head of...

Question 15

The ________ is the organ that delivers oxygen and nutrients and removes carbon dioxide and wastes for the embryo and later fetus.

Accepted Answer

The answer of The ________ is the organ that delivers...

Question 16

The pre-embryo becomes a hollow ball of cells with a fluid-filled cavity by about day 6 of development. This stage is called a ________.

Accepted Answer

A)  blastocoel 
B)  morula 
C)  blastula 
D)  blastocyst

Question 17

When two secondary oocytes are released from the ovaries and are fertilized by different sperm cells, what is the result?

Accepted Answer

A)  fraternal twins 
B)  identical twins 
C)  conjoined twins 
D)  clones

Question 18

In fetal circulation, most blood is shunted away from the lungs. Why is this the case?

Accepted Answer

A)  The lungs have their own circulation. 
B)  The lungs don't need any blood. 
C)  The lungs do not form until right before birth. 
D)  The fetus receives oxygen at the placenta, and the lungs are not yet fully functional.

Exam 25: Development Throughout Life