Homologous and analogous

homologous

indicates organisms shared a common ancestor

Same structure but may have different function

Divergent evolution

analogous

not evidence of a common ancestor

Same function but different structures

Convergent evolution

convergent evolution

separate species live in similar habitat, evolve similar analogous structures, look the same

But different species

divergent evolution

same species

Evolve in different ways, traits

Different environments evolve different traits so people think they are different species but they aren’t

Allopatric

-occurs when population is physically separated

Sympatric

occurs without separation

Allopatric and Sympatric

reproductive isolated

New species

Occurs in plants and animals