Practice Quiz for
Non-Random Mating

No. of Questions= 8

INSTRUCTIONS: To answer a question, click the button in front of your choice. A response will appear in the window below the question to let you know if you are correct. Be sure to read the feedback. It is designed to help you learn the material. You can also learn by reading the feedback for incorrect answers.


1

Evolution can result from:

     

a)

 non-random mating

b)

 random mating

c)

 consanguineous mating

d)

 A and C

 

2

The net effect of positive assortative mating is an increase in the frequency of:

     

a)

heterozygotes (Aa)

b)

dominant homozygotes (AA)

c)

recessive homozygotes (aa)

d)

all homozygotes (AA and aa)

3

The net effect of negative assortative mating is an increase in the frequency of:

     

a)

heterozygotes (Aa)

b)

dominant homozygotes (AA)

c)

recessive homozygotes (aa)

d)

all homozygotes (AA and aa)

4

In most human populations there is a tendency toward ____________________ mating.

     

a)

random

b)

negative assortative

c)

positive assortative

5

Continuous inbreeding can be dangerous for a small population because it can:

     

a)

keep the genetic diversity relatively small

b)

make the genetic diversity too large

c)

increase the rate of mutations

6

If a population has been mating non-randomly for a particular trait and there is then a single generation of random mating, the effect on the gene pool frequency of that trait will be:
(Assume that there are no other evolutionary mechanisms operating.)

a)

equilibrium--that is, no change between generations

b)

a continuation of the earlier pattern of evolution

c)

a gradual slowing down of the rate of evolution

7

The high frequency of hip dysplasia , epilepsy , and immune-system malfunctions in some dog varieties are primarily a result of _________________________ .

a)

heterosis

b)

Ellis-van Creveld syndrome

c)

consanguineous mating

8

The increased risk for significant birth defects among the offspring of first cousins is only __________ above the risk for the general population.

a)

1.7-2.8%

b)

6.8-11.2%

c)

97.2-98.3%

 


 

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