AP BIOLOGY

Detailed explanation-1: -Biological fitness, also called Darwinian fitness, means the ability to survive to reproductive age, find a mate, and produce offspring.

Detailed explanation-2: -In biology, fitness is the ability of an organism to survive and reproduce.

Detailed explanation-3: -In the crudest terms, fitness involves the ability of organisms-or, more rarely, populations or species-to survive and reproduce in the environment in which they find themselves 6–9. The consequence of this survival and reproduction is that organisms contribute genes to the next generation.

Detailed explanation-4: -There is no circular argument because “fitness” is simply a measurement of survival (which is defined as reproductive success); it’s not the mechanism driving survival. Organisms (or genes or replicators) don’t survive because they are fit; rather, they are considered fit because they survived.

Detailed explanation-5: -Reproductive fitness reflects the ability of individuals to pass on their genes to subsequent generations. Fitness traits, also referred to as life-history traits, include measures of fertility and mortality and are complex phenotypes that are direct targets of Darwinian selection.