Comment on How would a biologist best measure fitness from the the perspective of evolution? by JasSinc.
We have a saying, “fitness is measured in grandchildren.” That’s not a great saying either, but should be generalized to “fitness measured in descendants.”
That doesn’t match any of these choices, but here’s the one that will most likely be marked correct:
D.Fitness is best measured by the number of offspring. The more offspring an organism has, the more its genes will be represented in the next generation.
Why this isn’t great: Consider a stallion (male horse) that prefers jennies (female donkeys) over its own kind. Plenty of children. No grandchildren. Therefore low fitness.