A student recorded the height of each student in the school. She then made a bar graph of her results. She observed that the results form a bell-shaped curve. The student could use her graph as evidence to support which argument?

A bell-shaped distribution of heights is typical of a trait influenced by many genes, with each gene contributing a small effect. This is called polygenic inheritance, so the graph supports the argument that height is affected by multiple pairs of genes on different chromosomes. Dominance, codominance, and incomplete dominance generally describe interactions involving one or a small number of genes, not the broad variation shown here.

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