Danner micro natural selection

Natural Selection

Organisms with favorable traits survive and reproduce more

Evolution

A gradual change in a species over time; Organisms adapt to survive in their environment

Species

Must have similar characteristics and can produce fertile offspring

Selective pressure

variables in the environment that choose the adaptation

Adaptation

change that survives

Fossil Record

Record history of life, older rock, simpler organisms

Radioactive Dating

provides an actual age of a fossils or rock layer – allows to see the change in organisms over time

Homologous structures

different uses but same makeup

Vestigial structures

structure that is present today, but no longer serves a purpose – did serve a purpose to an ancestor

Analogous Structures

adapt to similar environment – NOT related

Embryology

early stages of vertebrates look alike

Biochemistry

molecules of life

Speciation

creation of new species

Adaptive radiation

Rapid divergent evolution….one common ancestor evolves to many different species

Convergent Evolution

different ancestors and became more similar over time

Co evolution

2 species influence each other’s evolution, adapt and depend on each other

Cladogram

shows the relationship between different organisms with respective to a common ancestor

Divergent evolution

similar species or same ancestors that adapt to different environments and become more dissimilar over time.

Artificial selection

humans breed for certain traits

Hybrids

2 diff species creating a possibly infertile offspring

Organisms over reproduce, There is variation in the offspring, The organisms compete for survival, Those that survive reproduce and pass on their DNA

the 4 ideas Darwin had

Common Descent

is the scientific theory that all living organisms on Earth descended from a common ancestor

extinction

Species that has died out, no longer living

era

Large block of time characterized by a dominant animal

mutation

change in dna

 Geographic Distribution

Similar animals live in similar climates (same natural pressures)