Chapter 3 Exam

Name: __________________________ Date: _____________

1.
A person's sex is determined by:
A)
nurture during prenatal development.
B)
the 23rd pair of chromosomes.
C)
the first pair of chromosomes.
D)
hormones released during prenatal development.

2.
In order, the three main periods of prenatal growth are:
A)
fetal, embryonic, germinal.
B)
germinal, embryonic, fetal.
C)
embryonic, fetal, germinal.
D)
germinal, fetal, embryonic.

3.
The germinal period ends approximately:
A)
two days after conception.
B)
two months after conception.
C)
two weeks after conception.
D)
twelve weeks after conception.

4.
How long is the fetal period?
A)
the last three months before the child's birth
B)
from the midway point of prenatal development until birth
C)
from the second until the eighth week after conception
D)
from nine weeks after conception until birth

5.
What percentage of natural conceptions fail?
A)
10 percent
B)
40 percent
C)
50 percent
D)
70 percent

6.
Babies born between ______ before and ______ after the assigned due date are considered to be on time.
A)
three weeks; two weeks
B)
two days; five days
C)
one week; three weeks
D)
two weeks; three weeks

7.
External sex organs are visible via ultrasound by the:
A)
end of the fourth week of pregnancy.
B)
end of the third week of pregnancy.
C)
end of the third month of pregnancy.
D)
end of the fifth month of pregnancy.

8.
The first organ system that shows any sign of activity is the:
A)
respiratory system.
B)
digestive system.
C)
nervous system.
D)
cardiovascular system.

9.
About eight weeks after conception, the embryo weighs ______ and is ______ long.
A)
1/8 gram; 1/8 inch
B)
1 gram; 1 inch
C)
2 grams; 2 inches
D)
5 grams; 5 inches

10.
At the end of the third month of gestation the fetus will weigh approximately ______ and will be about ______ long.
A)
87 grams; 10.5 centimeters
B)
3 grams;