Macroevolution Flashcards
Geologic record
History of the earth 4.6 billion years old
What is the. Ingest span of time
Eons
What is geological record order
Eons
Era
Period
Epoch
Phanerozoic era
Last 700 million year when everything we are familiar with came into existence when talking about multicellular organisms
Where did life start
In the ocean. Life on land is recent
What is the earliest eon
Hadeon (like hell when the planet was very hot so life couldn’t survive )
Stromatolites
Fossilized colonies of bacterial species. Rock like structure and the oldest fossils we ever found 3.5 billion years ago
Radiometirc dating
Based on radio isotopes
Radioactive unstable particles that undergo decay and don’t last forever
Half life is a span of time and every radio isotope has a different half life
Radioisotopes made up a organisms body and when they die the isotopes decay and we can get a graph from the half life and the isotope remaining
Gives an exacts date for macroevolution
What are the cores of the planet
Inner core Liquid
Outer core
Mantel -semi solid
Crust
When we’re all the continents together recently
251 mya called Pangea
Adaptive radiation
The number of species a lineage turns into. The more specious the greater the width of the lineage
Mass extinction
A lot of things are gone which effects the evolutionary history of all the things that survive
Permian extinction
98 percent of marine life was eliminated
Cretaceous extinction
Most recent extinction
65 million years ago of the Mesozoic era
What happens after mass extinction
More things become predators and the world becomes more dangerous
What are th three types of mammals
Monotremes
Marsupials
Eutherians
How can genes be similar but make different morphological species
Since genomes can be used to code for traits in different ways, the morphological aspect of two different species can look drastically different even though they may not be that different genetically
Developmentally can a be different depending on what genes are turned on or off
Heterochrony
Different timing
Two genetically similar organisms express their genes differently at different times during development and leave them on differently.
Chimps have a larger jaw than humans while humans have a larger cranium.
Pedomorphosis
Child like forming even in adulthood
Homiatic genes
Developmental genes that code for the interference of other genes
A gene that stops another gene
