The graph below is one complete cycle of the graph of an equation containing a trigonometric function. Find an equation to match the graph. If you are using a graphing calculator, graph your equation to verify that it is correct. 
Definitions:
Hox Gene Clusters
Groups of genes that control the body plan of an embryo along the head-tail axis by dictating the positions of various anatomical structures.
Anterior-Posterior Axis
A directional axis in biology, referring to the front (anterior) and back (posterior) orientation of an organism or its parts.
Ray-Finned Fishes
A class (Actinopterygii) of modern bony fishes; contains about 95% of living fish species.
Tetrapods
A vertebrate group that includes all species with four limbs, such as amphibians, reptiles, birds, and mammals, including those that have lost limbs through evolution.
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