Selection pressure can be regarded as a force that causes a particular organism to evolve in a certain d irection. Passing on your genes: Those with 'fit' genes reach reproductive age and pass genes to offspring Competition: Have to struggle for existenceĤ 'Survival of the Fittest': Those suited to environment surviveĥ. Overpopulation: leads to lack of resources neededģ. Variation: individuals within a population that have differences in their characteristicsĢ. When discussing about the animals there are 5 steps of Natural Selection. If you have variation, differential reproduction, and heredity, you will have evolution by natural selection as an outcome. If this process continues, eventually, all individuals in the population will be brown. The more advantageous trait, brown coloration, which allows the beetle to have more offspring, becomes more common in the population. The surviving brown beetles have brown baby beetles because this trait has a genetic basis. In this example, green beetles tend to get eaten by birds and survive to reproduce less often than brown beetles do. Since the environment can't support unlimited population growth, not all individuals get to reproduce to their full potential. To find out how it works, imagine a population of beetles:įor example, some beetles are green and some are brown. Natural selection is one of the basic mechanisms of evolution, along with mutation, migration, and genetic drift.ĭarwin's grand idea of evolution by natural selection is relatively simple but often misunderstood.
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |