Use your graphing calculator to determine if the equation appears to be an identity by graphing the left expression and right expression together. If so, then prove the identity. 
Definitions:
Heredity
The passing on of physical or mental characteristics genetically from one generation to another.
IQ Scores
Standardized scores derived from intelligence tests, designed to measure human intelligence as a relative performance to others.
Fraternal Twins
Twins who are born at the same time but develop from two different eggs fertilized by two different sperm, sharing about 50% of their DNA, similar to typical siblings.
Identical Twins
A pair of twins that developed from a single fertilized egg, sharing exactly the same genetic material.
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