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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Combined genetic info. of all members
Allele frequency is # of times alleles occur
2 processes can
lead to this:
change in DNA
Gene Shuffling –
Occurs when there is a change in relative frequency of alleles
(EG: tongue rolling)
2 Distinct Phenotypes
Result of male tiger and female lion mating incaptivity. Offspring are infertile.
Separated both geographically and ecologically.
Result of male lion and female tiger mating in captivity. Offspring are infertile.
Four species of leopard frogs: differ in their mating calls. Hybrids are inviable.
These squirrels live on opposite sides of the Grand Canyon. This is an example of allopatric speciation.
An example of adaptive radiation –
these species all diverged from a
common ancestor (founder species)
- FOUNDING OF A NEW POPULATION,
- GEOGRAPHIC ISOLATION which led to -- REPRODUCTIVE ISOLATION and
CHANGES IN THE NEW POPULATION’S GENE POOL due to COMPETITION.
Evidence of This is an example of allopatric speciation.
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
Flying Squirrel This is an example of allopatric speciation.
Rat like common ancestor
Big Question!!! This is an example of allopatric speciation.
Carbon-14 Dating This is an example of allopatric speciation.
Fossil Formation This is an example of allopatric speciation.
Big Bang Theory This is an example of allopatric speciation.
What was early earth like? This is an example of allopatric speciation.
So how did the earth get oxygen? This is an example of allopatric speciation.
How did life begin? This is an example of allopatric speciation.
Miller and Urey’s Experiment
Miller’s experiment suggests that lightning could have produced amino acids
How can simple amino acids result in life? produced amino acids There are 3 theories
1. Formation of microspheres
2 produced amino acidsnd Hypothesis for Life
Evolution of RNA to DNA
3 produced amino acidsrd Theory of Life