EVOLUTION & SPECIATION. VOCABULARY REVIEW. EVOLUTION – CHANGE OVER TIME NATURAL SELECTION INDIVIDUALS BETTER ADAPTED TO THE ENVIRONMENT ARE ABLE TO SURVIVE & REPRODUCE A.K.A. “SURVIVAL OF THE FITTEST”. NEW VOCABULARY. POPULATION GROUP OF INDIVIDUALS OF SAME SPECIES THAT INTERBREED
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EVOLUTION & SPECIATION
INDIVIDUALS BETTER ADAPTED TO THE ENVIRONMENT ARE ABLE TO SURVIVE & REPRODUCE
GROUP OF INDIVIDUALS OF SAME SPECIES THAT INTERBREED
COMMON GROUP OF ALL GENES PRESENT IN A POPULATION
Combined genetic information of all members
Allele frequency is # of times alleles occur
2 processes can
lead to this:
change in DNA
Gene Shuffling –
- Genetic Drift that occurs when individuals from a large population leave to establish a new population
- Allele frequencies of the new population will not be the same as those of the original
Occurs when there is a change in relative frequency of alleles
These squirrels live on opposite sides of the Grand Canyon. This is an example of allopatric speciation.
- FOUNDING OF A NEW POPULATION,
- GEOGRAPHIC ISOLATION which led to -- REPRODUCTIVE ISOLATION and
CHANGES IN THE NEW POPULATION’S GENE POOL due to COMPETITION.
Fossil Record provides evidence that living things have evolved
Fossils show the history of life on earth and how different groups of organisms have changed over time