In a diploid organism, the fitness benefit that is accrued by rearing one's own offspring is _______ that accrued by rearing a sister's offspring.

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In a diploid organism, the fitness benefit of rearing one's own offspring is twice that of rearing a sister's offspring due to the difference in genetic relatedness. An individual shares 50% of its genes with its offspring but only 25% with a niece or nephew (the offspring of a sister), making the genetic investment in one's own offspring twice as beneficial in terms of passing on one's genes.

In a Diploid Organism, the Fitness Benefit That Is Accrued