LIFE SCIENCE

Detailed explanation-1: -Evolution is the process by which populations of organisms change over generations. Genetic variations underlie these changes.

Detailed explanation-2: -What is evolution? Biological evolution refers to the cumulative changes that occur in a population over time. These changes are produced at the genetic level as organisms’ genes mutate and/or recombine in different ways during reproduction and are passed on to future generations.

Detailed explanation-3: -The theory also connects this gradual change of a population over time, called microevolution, with the processes that gave rise to new species and higher taxonomic groups with widely divergent characters, called macroevolution.

Detailed explanation-4: -Populations (or gene pools ) evolve as gene frequencies change; individual organisms cannot evolve. Variation in populations is determined by the genes present in the population’s gene pool, which may be directly altered by mutation.

Detailed explanation-5: -Evolution can be seen as a two-step process. First, hereditary variation takes place; second, selection is made of those genetic variants that will be passed on most effectively to the following generations.