variation and natural selection Flashcards
what is variation
the differences between all living things
why does variation BETWEEN SPECIES occur
the genes are different
why does the variation WITHIN A SPECIES occur
different genes and different environmental factors e.g living conditions
what are the differences between members of the same species e.g skin colour known as
characteristics
what is continuous variation
where a characteristic can have any value within a certain range e.g height or weight
what is discontinuous variation
where a characteristic feature can only take certain values e.g human blood
what is natural selection
the process where the characteristic becomes more or less common
order of how natural selection occurs
the organisms compete for resources to survive
the organisms with characteristic that make them better at competing are more likely to survive
these organisms are more likely to reproduce and pass on genes for useful characteristics to the next generation
overtime the useful characteristics become more common
