Evolution - Biology

• What might cause an anim

  al to become extinct?

  Environmental changes, more competition, a new disease
• Define evolution


  A change in one or more characteristics of a population, over a long period of time
• Define natural selection


  An organism is more likely to survive and reproduce because it has certain inherited characteristics
• Define variation


  The difference between things
• What was Jean Baptist's idea?


  His idea was, that every animal evolved from a primitive worm. The change was caused by the inheritance of acquired characteristics
• What were the problems with Jean Baptist's idea?


  ;
• What was Darwin's idea?

  His idea was, that evolution takes place through natural selection
• When was the first life form developed?

  3 billion years ago
• Why do many animals produce many offspring?

  To ensure that at least some will survive and pass on their genes
• Why do individual species show lots of variation?

  Because of the different genes they inherit
• Why does mutation happen?

  Because of the mistakes when copying the DNA
• What else does mutation do

  It provides more verity into a species
• What is extinction do?

  It is the permeant loss of all the members of species
• What do new forms of genes do?

  They result in changes in existing genes
• What is there always in any population?

  Variation
• What is variation caused by?

  Random mutations
• What do some of the mutations do?

  They helpp organisms survive better and long enough to breed