ap bio 19.3

Two examples provide evidence for natural selection

natural selection in response to introduced plant species, and the evolution of drug-resistant bacteria

the bacterium _________ is commonly found on people's skins or in their nasal passages

staphylococcus aureus (more than one pathway)

_______ strains are dangerous pathogens

MRSA (methicillin-resistant S aureus)

natural selection doesn't ________ but ____________

doesn't create new traits, but edits or selects traits already present

evolution is a process of ________

descent with modification

related species can have characteristics with ___________ that function __________

underlying similarity, differently

is similarity resulting from common ancestry

homology

are anatomical resemblances that represent variations on a structural theme present in a common ancestor

homologous structures

___________ revels anatomical homologised not visible in adult organisms

comparative embryology

are remnants of features that served important functions in the organism's ancestors

vestigial structures

is the evolution of similar, or analogous, features in distantly related groups

convergent evolution

______ arise when groups independently adapt to similar environments in similar ways

analogous traits

convergent evolution does not ______

provide information about ancestry

the fossil records provides evidence of

the extinction of species, the origin of new groups, and changes within groups over time

the study of the geographic distribution of species, provides evidence of evolution

biogeography

earths continents were formerly united in a single large continent called

Pangaea

are species that are not found anywhere else in the world

endemic species

_______ have many endemic species

islands closely related to mainland