Organic Evolution Chapter 6 Flashcards
Study for mid term exam
What are the five parts of Darwinian evolutionary theory?
Perpetual change
Common descent
Multiplication of species
Gradualism
Natural selection
What is perpetual change
The world as well as organisms are constantly changing
What is radiometric dating
Using elements half life to determine the age of a object/fossil/mummy
What is the formula for Radiometric dating
N(t) = N_0(1/2)^(t/t_1/2)
What is Common descent
It is the theory that all life evolved from a common ancestor
What are phylogenetic trees
Family trees that show species relationships
(Gene= DNA relation Phylo =race, tribe, ect)
What is Ontogeny
The study of developments
What is the Multiplication of species
It means speciation exists.
Speciation is defined by the formation of new species
What are the two types of reproductive barriers that can cause multiplication of species
Pre-zygotic and post-zygotic
What are some examples of Pre-zygotic reproductive barriers
Physical isolation
Physical shape
Behaviors
Gametes don’t join
What are some examples of post- zygotic reproductive barriers
Embryos don’t develop
Offspring is sterile
What is gradualism
It is defined by the accumulation of small changes (micro evolution ) leads to large changes ( macro evolution )
What is natural selection
There are four parts to the theory of natural selection
1) Some individuals can have the best traits for a specific environment
2) Produce more offspring
3) Leads to evolution of adaptions
4) organisms are never perfectly adapted
What are the three types of graphs that populations experiencing natural selection go through
Stabilizing ( Moderate becomes more common)
Directional ( an extreme becomes more common)
Disruptive ( Both extremes become more common)
What is micro evolution
It is the chance in allele frequency over time
