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Page 8
Question 19
4 out of 4 points
Physicians are currently able to correct spina bifida at around the seventh or eighth month of
pregnancy using
Selected Answer:
d.
fetal surgery.
Answers:
a.
ultrasound.
b.
chorionic villus sampling.
c.
genetic engineering.
d.
fetal surgery.
Question 20
0 out of 4 points
The cutoff between normal and low birth weight is about ____ pounds.
Selected Answer:
c.
3.3
Answers:
a.
2.2
b.
5.5
c.
3.3
d.
7.7
Question 21
0 out of 4 points
_________ occurs when an individual intentionally seeks out an environment that matches
characteristics driven by his or her genes.


Page 9
Selected Answer:
b.
Incomplete dominance
Answers:
a.
Polygenetic inheritance
b.
Incomplete dominance
c.
Niche-picking
d.
Passive gene-environment interactions
Question 22
0 out of 4 points
A(n) _______________ allele is ignored when it is combined with a dominant allele.
Selected Answer:
[None Given]
Correct Answer:
Evaluation Method
Correct Answer
Case Sensitivity
Exact Match
recessive
Question 23
0 out of 4 points
The point at which a zygote burrows into the uterine wall is referred to as
Selected Answer:
a.
fertilization.
Answers:
a.
fertilization.
b.
dilation.
c.
niche-picking.
d.
implantation.
Question 24


Page 10
4 out of 4 points
If you were looking through a microscope at a normal sperm cell, you should see ____ chromosomes.
Selected Answer:
c.
23
Answers:
a.
2
b.
46
c.
23
d.
22
Question 25
4 out of 4 points
What began as a single fertilized egg has just separated into two distinct eggs. This indicates the
formation of ____ twins that has occurred during the ____ period of development.
Selected Answer:
c.
identical; zygotic
Answers:
a.
fraternal; embryonic
b.
identical; embryonic
c.
identical; zygotic
d.
fraternal; zygotic


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