Random Flashcards
When did the earth form?
4.6 billion years ago
What is convergent evolution?
Evolution of similar traits because of similar selective pressures
When did prokaryotes evole?
3.5 billion years ago
When did eukaryotes evolve?
Between 1.8 and 2 million years ago
When did multicellularity evolve?
1.2 to 1.5 billion years ago
When did the End Cretaceous mass Extiction happen?
65.5 Mya
When did the end Permian mass Extiction happen?
251 MYA
What are some major events that happend in the Paleozoic?
Colonization of land.
Origin of vertebrates and vascular plans, insects and amphibians
Fish reptiles and insects diversify
What are some major events of the Mesozoic?
Origin of mammals and Dino’s
Come bearing plants diversify
Origin of flowering plants
Dino’s Extiction
What are some major events in the Cenozoic?
Continued diversification of flowering plants, mammals, birds, insects
Primates evolve
What is some evidence of the crater during the KT Extiction?
Iridium anomaly- unusually high levels of iridium in the rocks dating to about 65.5 Mmy
Unusual minerals- shocked quarts and microtektites
Impact crater- yucatan peninsula
What happens after mass exticitons?
Periods of adaptive radiation
Phyletic shifts
Shifts in dominance
Name the periods starting at Cambrian
Cambrian Ordovician Silurian Devonian Carboniferous Permian Triassic Jurassic Cretaceous Paleogene Neogene
What are the first remnants of life called
Stromatolites
When was the major diversification of euk?
800 Mya
Describe simple multicellularity
2 dimensional Little to no communication Very little differentiation All cells in contact with the environment Evolved multiple times
What are some pros for simple multicellularity
Good for gathering resources
Give protection from predation
Anchor in desirable location
Lose part of body without being fatal
Does simple multicellularity lead to complex multicellularity
No
How did photosynthesis spread through euk?
Plastids of distantly related euk should fall into two different gourds depending on whether they evolved through an endosymbiosis with red or green algae
What organisms are diploblastic?
Cnidarian and Ctenophora
Are all bilaterally symmetrical animals triploblastic?
Yes
What is the Coelm?
A fluid filled body cavity entirely lined by mesoderm
What is a pseudocloem?
Fluid filled body cavity partly lined by mesoderm
What are the two force generating tissues?
Muscle and myoepithelial cells
What does a larger mechanical advantage mean?
Better for force production
Worse for speed
