The fur color of squirrels in the species is likely determined by a combination of genetic and environmental factors.
Genetic factors play a role as fur color in this species is determined by dominant and recessive traits. The transfer of black squirrels from the cold to the hot climate indicates a genetic basis for black fur. However, environmental factors, like temperature, can also influence gene expression, as seen in the California rabbits with temperature-sensitive alleles.
Therefore, it is likely that both genetic and environmental factors interact to determine the fur color in this squirrel species.
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