Quiz #8 Flashcards
The ability to replicate
life
demonstrated that amino acids could be created in a primordial sea
Stanley Miller
Formation of small molecules
Formation of Self-Replication
Development of a Membrane
life began
able to make copies of itself
RNA
Double stranded. which may have taken over as the preferred method of Preserving information
DNA
-information on how to build a membrane may have been incorporated in self-replicating molecules
-this makes metabolism possible
The membrane Develops
populations of organisms that inherited or could possibly interbreed under natural conditions, and cannot interbreed with other such groups
species
individuals are physically unable to mate with each other
-ex: Dogs and Pigs share the same ancestor but can no longer mate
Pre-Zygotic barriers
Matings produce hybrid individuals that do not survive long after fertilization
-ex: Donkey and Horse can mate but produce Sterlin offspring
Post-Zygotic Barriers
Domain, kingdom, phylum, class,order,family,genus,species
Hierarchical System
once species splits into two distinct species
speciation
speciation that occurs as a result of a physical barrier that separates a population and prevents them from reproducing with each other
Allopatric Speciation
changes in allele frequencies over short periods of time, does not result in speciation
Microevolution
Microevolution changes over a long period of time that can result in speciation
Macroevolution
prokaryotes, Archea bacteria, eukaryotes
three domains of life
protists, plants,fungi,animals
kingdoms
pathogenic or disease causing
bad bacteria
beneficial bacteria
good bacteria
many species live in extreme environments
-dominant in the deep seas
-look similar to bacteria
-however they also have enzymes and membranes similar to eukarote
Archea domain
unlike prokaryotes, have a nucleus
eukoryoytes
the earliest evidence we have for life is a chemical signature of it carbon utilization, as recorded in rocks found in Greenland dated to about 3.6 b.y.a
The precambrian
the complete loss of all individuals in a species population
extinction
a period where a large number of species on earth become extinct over a short period of time
mass extinction
