Lesson 5 Flashcards
Regarded fossils as evidence for former life
But believed that former organisms have been killed by natural disasters (e.g. cataclysmic flood
Greeks
Inheritance of acquired characteristics
E.g. neck of giraffes
Jean baptiste de lamarck
Changes happen in a
population
Caused by variations that exist between species in a group/population
Charles darwin
Living things came from a common ancestor
Evidences include homology and ontogeny
Common descent
Similarities in anatomy
Homology
Development of an organism from embryo to adulthood
Ontogeny
Evidences of Darwinian Theory of Evolution
• Multiplication of Species (Speciation)
• Common Descent
groups are separated by physical barrier
Allopatric speciation
divergence occurs without a physical barri
Sympatric speciation
• Formation of multiple species from a single population in response to selective pressures
Adaptive radiation
Slow-but-steady evolutionary change
Phyletic gradualism
Rapid changes prompted
by disruptive events
May also be the result of lacking fossil evidenc
Punctuated equilibrium
survival of the most adapted in the environment”
Natural selection
Genetic variation and change within a species
Micro evolution
• Occurrence of different allelic forms of a gene in a population
Polymorphism
• All alleles of all genes in a population form th
Gene pool
Change in frequency of alleles/gene variants in a gene pool
Genetic drift
Major evolutionary events
• describes large- scale events in organic evolution
Macro evolution
Major evolutionary events
• describes large- scale events in organic evolution
Macro evolution
