Tag Archives: evolution

5- Selection & Evolution

Darwin’s Origin of the Species & Natural Selection

One of the key points of selection and evolution is that of Natural Selection – that some organisms have a better chance of survival than others.

Let’s look at what might happen:

  • Organisms within a population are not identical, varying in both genotypes and phenotypes.
  • While some organisms in the population survive, others die (removing themselves from the gene pool).
  • The surviving organisms then breed, passing on their genes to their offspring. (As the parent organisms survived, it is likely they hold some advantageous genetic characteristics that the organisms which perished did not).
  • This increases the frequency of the advantageous genes in the population, and the cycle can begin again.

Over time, the population is filtered to leave only organisms with characteristics suited to their environment – helping them survive.