The scenario you're describing, where black fur color and tan fur color are determined by a mouse's genes, relates most closely to the principle of Inheritance. This principle refers to the way traits and characteristics are passed down from one generation to the next through genetic information. The fur colors are the result of genetic coding that can be inherited by offspring.
While the other principles mentioned (Variability, Overproduction and differences in survival or reproduction, and Adaptation) are also important aspects of natural selection, the mention of fur colors specifically emphasizes the role of genetic inheritance.
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