More About natural Selection
Peppered Moths
It is a known fact that peppered moths are able to survive and camouflage well during the daytime. However, occasionally a few moths have a genetic mutation causing them to be all black. Likewise, black moths resting on any type of plant are not very well camouflaged which means it is easy for their prey to see. Thus, these black moths never get to reproduce and pass on their genes. But,as time went by in the industrial revolution, the coal and industrialization caused the trunks and walls to blackened. This meant that the black moths were able to survive better and the peppered moths were more noticeable to their preys. Natural selection favored both types of moth by favoring the moth that is best suited to the environmental conditions.
It is a known fact that peppered moths are able to survive and camouflage well during the daytime. However, occasionally a few moths have a genetic mutation causing them to be all black. Likewise, black moths resting on any type of plant are not very well camouflaged which means it is easy for their prey to see. Thus, these black moths never get to reproduce and pass on their genes. But,as time went by in the industrial revolution, the coal and industrialization caused the trunks and walls to blackened. This meant that the black moths were able to survive better and the peppered moths were more noticeable to their preys. Natural selection favored both types of moth by favoring the moth that is best suited to the environmental conditions.
Lamarck and Darwin's Ideas on Natural Selection
Darwin
1.Variations of inheritable features which already normally exist
2. Environment selects features contributing to survival and tends to eliminate the others
3. Those with traits which help survival tend to survive and have more offspring, who inherit those traits
4. New species (evolve and eventually come)
5. Extinction of species
Darwin's theory revolved our how individuals compete for limited resources and show natural variation in a group of organisms (population). Then, the individuals with characteristics best suited to their environment are more likely to survive to reproduce and it continues as successful characteristics are inherited. Dawrin's theory proved to be logically right and is believed today.
1.Variations of inheritable features which already normally exist
2. Environment selects features contributing to survival and tends to eliminate the others
3. Those with traits which help survival tend to survive and have more offspring, who inherit those traits
4. New species (evolve and eventually come)
5. Extinction of species
Darwin's theory revolved our how individuals compete for limited resources and show natural variation in a group of organisms (population). Then, the individuals with characteristics best suited to their environment are more likely to survive to reproduce and it continues as successful characteristics are inherited. Dawrin's theory proved to be logically right and is believed today.
Lamarck
1. Environment changes, thus "creating a "need" to change
2. Development of new features ( in order to survive or so that one can survive)
3. Newly acquired traits somehow get passed down to offspring
4. New Species (eventually)
5. No such thing as extinction
His theory was eventually discredited because acquired characteristics do not have a genetic basis. His theory was based upon two ideas which include the law of use and disuse and the law of inheritance of acquired characteristic. Also, it was stipulated that a characteristic which is used more and more by an organism becomes stronger and bigger.
1. Environment changes, thus "creating a "need" to change
2. Development of new features ( in order to survive or so that one can survive)
3. Newly acquired traits somehow get passed down to offspring
4. New Species (eventually)
5. No such thing as extinction
His theory was eventually discredited because acquired characteristics do not have a genetic basis. His theory was based upon two ideas which include the law of use and disuse and the law of inheritance of acquired characteristic. Also, it was stipulated that a characteristic which is used more and more by an organism becomes stronger and bigger.
example
Example of difference in Lamarck and Darwin's Theory
This example will show the explanation of why giraffes have long necks.
Lamarck
1. a giraffe stretches its neck to reach food high up
2. the giraffe's neck gets longer because it is used a lot
3. the giraffe's offspring inherit its long neck
Darwin
1. a giraffe with a longer neck can reach food high up
2. a giraffe is more likely to get enough food to survive to reproduce
3. a giraffe's offspring inherit its long neck
Both examples show a process of natural selection based upon their theories (down below) however Darwin's theory is proven to be the correct one unlike Lamarck's theory. Likewise, natural selection will be an on going process because as organisms, we need to adapt and choose the best characteristic that is suitable for our environment. It is an on going process because the environment and atmosphere is continuously changing and no one can stop that. we can only evolve and adapt to our surroundings to produce successful off springs for the future generations.
This example will show the explanation of why giraffes have long necks.
Lamarck
1. a giraffe stretches its neck to reach food high up
2. the giraffe's neck gets longer because it is used a lot
3. the giraffe's offspring inherit its long neck
Darwin
1. a giraffe with a longer neck can reach food high up
2. a giraffe is more likely to get enough food to survive to reproduce
3. a giraffe's offspring inherit its long neck
Both examples show a process of natural selection based upon their theories (down below) however Darwin's theory is proven to be the correct one unlike Lamarck's theory. Likewise, natural selection will be an on going process because as organisms, we need to adapt and choose the best characteristic that is suitable for our environment. It is an on going process because the environment and atmosphere is continuously changing and no one can stop that. we can only evolve and adapt to our surroundings to produce successful off springs for the future generations.
