# Precalculus : Graphs

## Example Questions

### Example Question #1 : Graphs

Information about the Hardy Weinberg equation: http://www.nature.com/scitable/definition/hardy-weinberg-equation-299

The Hardy Weinberg equation is a very important concept in population genetics. Suppose we have two "alleles" for a specific trait (like eye color, gender, etc..)  The proportion for which allele is present is given by  and

Then by Hardy-Weinberg:

, where both  and  are non-negative.

Which statement discribes the graph that would appropriately represents the above relation?

Parabola opening up passing through the point

Curved line passing through the point

Straight line passing through the point

Straight line passing through the point

Straight line passing through the point

Explanation:

The equation can be reduced by taking the square root of both sides.

As a simple test, all other values when substituted into the original equation fail.  However,  works. Therefore  is our answer.