3.31 Evolution

evolution: - change in the form of organism (the new form of organism arriving)

- a change in the frequency of alleles

natural selection: - the mechanism of evolution and was first proposed by Charles Darwin

S.A - Causes skin infection and lung infection 

Evolving S.A

1st graph:

- the normal form of SA is susceptible to being killed by methecilline (antibiotic)

- it kills SA

-MSSA

2nd graph:

-random mutation

- break down methecilline 

-resistant form

-MRSA

2 form of bacteria (MSSA, MRSA)

- when antibiotic are applied to the population, MSSA is decreased and MRSA is increased (because resistant to antibiotic)

- increase in frequency of allele for resistant

2 features:

-random mutation - produce the MRSA form

-non-random selection - MRSA survive, MSSA to be killed

=natural selection