Bio 3.4.1: Fossil, Biochemical, and Anatomical Support Evolution
- The atmosphere had little or no oxygen at the beginning
- Electric sparks in a substance created some organic molecules
- First there was anaerobic (which lived in water) and prokaryotic, then photosynthetic, then eukaryotic, and then multicellular
- Fossils support the theory of evolution by.... 1. Comparing layers of sediment to see which fossil has been dead the longest, 2. Transition Fossils (those that have characteristics of more than one organism), and 3. Most fossils are similar to organisms of today which represent evolutionary change
- Biochemical Similarities that represent evolution is that genetic analysis shows similarities among species which reflect evolutionary origins, many cellular and biochemical processes are conserved in a variety of species, and Vestigial biochemical pathways ( For example pancreatic cells are light sensitive even though they are way deep down in the body)
- Anatomical structure are pieces of the body that we have evolved to no longer use yet it is still there and present in another animal
- Evolution Virtual Lab Link:
Bio 3.4.2: Natural Selection Influences Changes in Species
- Species do have the potential to increase exponentially
- Populations are genetically variable due to mutations and genetic recombination
- There is a lot of resources required for life
- Changing environments make for specific genetic phenotypes
- Organisms with favorable adaptions survive, reproduce, and pass on their genes
- The accumulation and change in favored alleles leads to changes in species over time
- Geographic Isolation causes speciation because a species is separated and one half has to adjust to the new environment and so their phenotype changes creating a whole new species from that one
- Natural Selection Lab Link:
Bio 3.4.3: Various Disease Agents Influence Natural Selection
Exposed animals who possess the disease and survive have an immunity to it and are the ones to survive and reproduce
The ones who cannot survive a disease are the weaker ones who did not need to pass on those genes
The offspring can also inherit immunity
Disease Lab Link:
http://evolution.about.com/od/teaching/a/Spreading-Disease-Lab.htm
The ones who cannot survive a disease are the weaker ones who did not need to pass on those genes
The offspring can also inherit immunity
Disease Lab Link:
http://evolution.about.com/od/teaching/a/Spreading-Disease-Lab.htm