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A student attempts to recreate a classic experiment and examines the number of hair bristles on the thorax of a fruit fly. She examines several different fruit fly lines and creates the following graph:

Figure 1. Bristle number versus temperature in three fruit fly lines. Created for Copyright 2017. All rights reserved.

Her results BEST demonstrate that which factor(s) drives phenotype?


Genes (“Nature”).


Environment (“Nurture”).


A combination of both genes and environment.


Genetic promoters.

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