well supported testable explanation
change in living things over a period of time
preserved remains or evidence of an ancient organism
when humans can select variations of organisms that are useful & breed these individuals
Struggle for existence
competition among members of species for food, space etc.
ability of an organism to survive & reproduce
inherited trait that increases an organisms survival
Survival for the fittest
also called natural selection; when individuals are better suited to environment
how evolution occurs; changes in inherited traits of population
all species, living & extinct, came from 1 common ancestor "tree of life"
all genes in a population
how common a gene is in a population
Single gene trait
trait controlled by a *single gene (2 alleles)
trait controlled by *more than 1 gene
process of forming new species
species may be able to mate & the resulting offspring may be okay to reproduce, but if they aren't fertile than they can't
when 2 populations are able to breed but have differences in reproductive behavior that prevents mating
when 2 populations are able to breed but are seperated by barriers (Mountains, Rivers)
when 2 populations are able to breed but reproduce at different times
said earth is shaped by geological forces over time
said if human population continues to grow there wont be enough space and food
first to propose an explanation of how things change over time; wasn't correct
processes occuring now have shaped the earth
writes to darwin about natural selection
5 types of evidence that support Darwins theory
shows gradual changes over time
different locations (environments) that can cause variety of organism changes
organisms with similar body structures share common ancestor (similar function & structure)
structure with no function (human apendix)
development of vertebrates are very similar
2 sources of variation in a population
change in DNA sequence
when genes form new combinations during prophase 1 of meiosis
Time period when Darwin traveled & developed his ideas
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