LIFE SCIENCE

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: -Fitness does not include a measure of survival or life-span; Herbert Spencer’s well-known phrase “survival of the fittest” should be interpreted as: “Survival of the form (phenotypic or genotypic) that will leave the most copies of itself in successive generations."

Detailed explanation-3: -"Survival of the fittest” is a phrase that originated from Darwinian evolutionary theory as a way of describing the mechanism of natural selection. The biological concept of fitness is defined as reproductive success.

Detailed explanation-4: -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-5: -Essentially, the fitness of the individual is based on its ability to pass genetic information on to the next generation, as opposed to any physical characteristic or trait.