AP BIOLOGY

Detailed explanation-1: -Fitness is a measure of how well organisms survive and reproduce, with emphasis on “reproduce.” Officially, fitness is defined as the number of offspring that organisms with a particular genotype or phenotype leave behind, on average, as compared to others in the population.

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: -survival of the fittest, term made famous in the fifth edition (published in 1869) of On the Origin of Species by British naturalist Charles Darwin, which suggested that organisms best adjusted to their environment are the most successful in surviving and reproducing.

Detailed explanation-5: -The biological concept of fitness is defined as reproductive success. In Darwinian terms, the phrase is best understood as “Survival of the form that will leave the most copies of itself in successive generations."