Listed are 2 of the core theories of evolution. For each, give a definition or brief explanation of
the theory and 2 examples of the type of evidence we have that supports the theory.
The theory of common descent –
2 examples of supporting evidence:
The theory of natural selection –
2 examples of supporting evidence:
Solution
Evolution:
Evolution is a process of change through time. It is the process by which modern organisms have
descended from ancient organisms.
In genetic terms, the change in the frequency of alleles in populations from one generation to
another generation. (change over time).
A. The theory of common descent:
According to the principle of common descent, all species (living and extinct) are descended
from ancient common ancestors.
In common descent theory darwin explains, that organisms are descended from common
ancestors that gradually change over time into entirely new organism.
To create new species, many generations must pass on traits with slight modifications.
Examples:
1. Archaeopteryx is between reptiles and birds.
2. Eustheopteron is an amphibious fish.
3. Seymouria is a reptile-like amphibian.
4. Therapsids were mammal-like reptiles.
B. Darwin\'s Natural selection:
According to the Darwin, It is the process that results in adaptation of an organism to its
environment which means of selectivity reproducing changes in the genotype.
In the process of evolution the natural selection is a basic mechanism, it is mainly happens due to
the mutations, migrations and genetic drift.
Examples:
1. The beaks of Darwin finches. The finches of the Galapagos islands were adopted to the island
in different ways, but are believed to share a common ancestor.
2. Peppered moths and industrial pollution: Natural selection favored dark colored moths in areas
of heavy pollution, while light colored moths are survived better in less polluted area.
3.The soapberry bugs have must mutated their beaks length genes, when they ran out of food.
Beak size variation:
In South Florida soapberry bugs feed on balloon vine tree with large fruits, longer beak present
in them.
In North Florida soapberry bugs feed on golden rain tree with small fruits, they have shorter
beaks..
Listed are 2 of the core theories of evolution. For each, give a def.pdf
1. Listed are 2 of the core theories of evolution. For each, give a definition or brief explanation of
the theory and 2 examples of the type of evidence we have that supports the theory.
The theory of common descent –
2 examples of supporting evidence:
The theory of natural selection –
2 examples of supporting evidence:
Solution
Evolution:
Evolution is a process of change through time. It is the process by which modern organisms have
descended from ancient organisms.
In genetic terms, the change in the frequency of alleles in populations from one generation to
another generation. (change over time).
A. The theory of common descent:
According to the principle of common descent, all species (living and extinct) are descended
from ancient common ancestors.
In common descent theory darwin explains, that organisms are descended from common
ancestors that gradually change over time into entirely new organism.
To create new species, many generations must pass on traits with slight modifications.
Examples:
1. Archaeopteryx is between reptiles and birds.
2. Eustheopteron is an amphibious fish.
3. Seymouria is a reptile-like amphibian.
4. Therapsids were mammal-like reptiles.
B. Darwin's Natural selection:
According to the Darwin, It is the process that results in adaptation of an organism to its
environment which means of selectivity reproducing changes in the genotype.
In the process of evolution the natural selection is a basic mechanism, it is mainly happens due to
the mutations, migrations and genetic drift.
Examples:
1. The beaks of Darwin finches. The finches of the Galapagos islands were adopted to the island
in different ways, but are believed to share a common ancestor.
2. Peppered moths and industrial pollution: Natural selection favored dark colored moths in areas
of heavy pollution, while light colored moths are survived better in less polluted area.
2. 3.The soapberry bugs have must mutated their beaks length genes, when they ran out of food.
Beak size variation:
In South Florida soapberry bugs feed on balloon vine tree with large fruits, longer beak present
in them.
In North Florida soapberry bugs feed on golden rain tree with small fruits, they have shorter
beaks.
