McGraw-Hill Online Learning Center Test

1. Review the image and answer the following questions.

Why is there such a variation in height among any human population, as illustrated by this graph?

A. Height is controlled by many genes, which add variation to height of individuals within a population.
B. Nutrition plays a role in the height that is attained; those with poorer nutrition tend to be shorter in stature.
C. Both of the above are true.
D. Neither of the above are true.

2. This graph shows a continuous variation in the height of a specific population at Connecticut Agricultural College in 1914. Why are the extremes much rarer than the intermediate heights?

A. Extra short and extra tall genes tend to be lethal.
B. Extra short and extra tall people are due to hormonal imbalances that occur infrequently in a population.
C. Individuals on the short and tall end of the distribution are due primarily to random variation.
D. Students that were too short or too tall were not accepted at this college during this era.

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