A focal primate female has no offspring of her own but has two female full siste

Question

A focal primate female has no offspring of her own but has two female full sisters (all have the same parents). One sister dies and the focal female adopts the sister’s single offspring. The other sister has two offspring of her own, which live to adulthood without requiring any help from the focal primate. This means that the three sisters, in total, have produced 3 offspring (with unrelated males as the fathers). What is the inclusive fitness outcome for the focal female? Don’t forget to include relatedness in your calculations. And don’t forget that this is a thinking question.

A. 0.25

B. 1.0

C. 0.5

D. 0.75

Explanation / Answer

A focal primate female has no offspring of her own but has two female full siste

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