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3.30 Describe the process of evolution by means of natural
3.30 Describe the process of evolution by means of natural

3.30 Describe the process of evolution by means of natural - PowerPoint Presentation

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3.30 Describe the process of evolution by means of natural - Description

  332 Understand how resistance to antibiotics can increase in bacterial populations natural selection Natural Selection Darwin put forward the theory of natural selection It can be ID: 540577 Download Presentation

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selection natural survive reproduce natural selection reproduce survive adapted environment organisms offspring antibiotics survival struggle characteristics genes resistance theory

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Presentation on theme: "3.30 Describe the process of evolution by means of natural"— Presentation transcript

Slide1

3.30 Describe the process of evolution by means of natural selection. 3.32 Understand how resistance to antibiotics can increase in bacterial populations (natural selection).

Natural SelectionSlide2

Darwin put forward the theory of ‘natural selection’.It can be summarised by the following points:Variation

Over-production

Struggle for existenceSurvival of the fittestAdvantageous characteristics passed on to offspringGradual change

Natural selection Slide3

VariationOrganisms are genetically different, they have different characteristicsSome may be slightly better adapted to their environment than others.

 

Variation Slide4

 Over-ProductionMore offspring are produced than will survive. 

Over-productionSlide5

 Struggle for ExistenceThere will be competition between organisms for resources e.g. food, water, light, shelter and mates.

 

Struggle for existenceSlide6

 Survival of the FittestOnly those who are best adapted to their environment will survive and reproduce (the strongest).

 

Survival of the fittestSlide7

ReproduceBeneficial genes and characteristics will be past onto offspring when these organisms reproduceThis is the theory of natural selection - when nature selects which organisms will survive and reproduce. Those that are best-adapted to their environment will pass their genes onto their offspring.

Reproduce Slide8

Some bacteria can become resistant to antibiotics, such as penicillin.Antibiotic resistance