Please enable JavaScript.
Coggle requires JavaScript to display documents.
5.2 Natural selection (Struggle for survival (There are some parents that…
5.2 Natural selection
-
Antibiotic Resistance
When patients do not completely consume all the antibiotics prescribed to them, some of the bacteria might not die and undergo mutations which increase their antibiotic resistance
These resistant bacteria will the survive and reproduce, creating more identical resistant bacteria.
The same antibiotics would not be effective against the bacteria any longer, allowing the bacteria to survive.
-
Antibiotics kill bacteria or weaken them to allow the immune system to destroy the invading pathogen
Adaptations
Adaptations are features of organisms that aid their survival by allowing them to be better suited to their environment
-
-
-
-
-
Struggle for survival
- There are some parents that put a focus raising their young (mostly mammals) and this allows them to have few offsprings
In this case, having too many offspring would cause the demand of resources to increase
- Due to the limited supply of resources in the ecosystem, overpopulation occurs and this creates competition within a population where they compete for mates, food, space, predation, etc.
- Parents produce many offspring to make sure that at least some offspring make it to the next generation
- Thus, the development of a species would require the organisms with beneficial traits to become reproductively isolated where they only reproduce with those with similar genetic traits
- In most cases, only a few offspring make it to adulthood and the rest die along the way
- Since there is genetic variation within a population, the organisms with beneficial characteristics will be able out-compete other individual.
Therefore, these organisms, will survive and pass their traits onto the next generation
- Populations tend to produce more than the environment can support.
- Over many generations, the accumulation of beneficial genetic traits will result in a change in the majority of the population known as evolution
- However, acquired characters such as muscular strength cannot be passed on to the organism's offspring
-