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
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
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.
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
Rat like common ancestor
Miller and Urey’s Experiment
Miller’s experiment suggests that lightning could have produced amino acids
1. Formation of microspheres
Evolution of RNA to DNA