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Relative fitness between red and brown wolves

You find that out of 20 of red wolves released, 18 survive, and out of 10 brown wolves released, 4 survive. What is the relative fitness of red and brown wolves?

I have the fitness of the red wolves (favored genotype?) as 1, but I keep getting a negative number for the brown wolves' fitness.

Solution Preview

Relative fitness (w) is the survival and/or reproductive rate of a genotype (or phenotype) relative to the maximum survival and/or reproductive rate in the population. Based in this, to calculate relative fitness of each phenotype you have to divide each phenotypes survival or reproductive rate by the ...