evolution and natural selection

Evolution and natural selection

natural selection encourages advantageous phenotypes

populations of species usually show a lot of genetic variation, this means that there is a big mix of gene variants (alleles) present in the population

variants arise when DNA randomly mutates 

the resources living things need to survive are limited, individuals must compete for these resources to survive 

some genetic variants give rise to characteristics that are better suited to a particular environment e.g. being able to run away faster from predators   this means that organisms have an advantageous phenotype. these indivduals will have a better chance of survival and so have an increased chnace of breeding and passsing on their genes  

this means that a greater proportion of individuals in the next generation will inherit the advantageous variants so theyll…