Variation

As a change in the inherited characteristics of a population over time through a process of material selection which may result in the formation of a new specie

1) individual in a specie show a wide range of variation due to mutation 2) individual with characteristic most suited to the environment are more likely to survive and reproduce The gene that allowed the individual to be successful are passed to the offspring in the next generation

Death Extinction (for specie)

A random mutation might cause some bacteria to become resistant to certain antibiotics such as penicillin

A group of bacteria including genetically resistant ones ar exposed to an antiobiotic Most of the sensitive ones die The genetically resistant bacteria start multiplying Eventually the resistant strain replaces the strain affected by antibiotic

Artificial selection Humans to develop new organism with desirable characteristics Individual with desirable characteristics are selected to breed

1) select the organism with desired characteristics 2) breed them together 3) select the offspring with desired characteristics and breed them together 4) repeat the process for many generations

Occurs naturally Results in development of population with features that are better adapted to their environment and survival Usually takes a long time

Occurs when human intervene Results in the development of population with features that are useful to humans and not necessarily for the survival of individual Take less time as only individual with desir3d features are allowed to reproduce