Introduction to Evolution:
Evolution is the process in which organisms have developed and evolved since the beginning of time.
Evolution is the process in which organisms have developed and evolved since the beginning of time.
Natural Selection:
Natural Selection is often described as "survival of the fittest". It was for organisms that were those best suited to the environment, to survive, and are able to reproduce. It was the first theory described by Charles Darwin There are 3 types of natural selection: Stabilizing selection - the environment supports the medium trait. Directional selection - the environment supports either extreme. Disruptive selection - the environment supports both extremes. |
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Mutation: In a mutation , it is the only way new alleles can be formed. It can be harmful or helpful, depending on what is changing. Again, it may affect reproductive success, depending on what is being affected. First, there is a change in DNA, a change in codon, change amino acid sequence, an then there is a protein.
Migration: Migration is one a group of individuals move from one population to another. the migrant allele changes the allel frequency.
Genetic Drift: Genetic Drift is when there is a random in the allele frequency
Migration: Migration is one a group of individuals move from one population to another. the migrant allele changes the allel frequency.
Genetic Drift: Genetic Drift is when there is a random in the allele frequency
Evolution Of the giant clam:
The ancestors of bivalves are brachipods. They were the first clam-like species, nearly 252 million years ago. Clams had to develop their gills over millions of years due to changes in their habitat.
Special Adaptions: Did you know that...
- Giant Clams feed off an algae that live in their tissue.
- Giant clams are hermaphrodites, producing both egg and sperm.
- They grow calcium carbonate shells as protection