E6 - Evidence for Evolution Flashcards
TRUE OR FALSE: Closely related species share many homologous (similar/same) features, even if they do not serve the same function AND IS AN OUTCOME OF NATURAL SELECTION
TRUE
TRUE OR FALSE: Species may have vestigial structures that once served a function in their ancestors AND IS AN OUTCOME OF NATURAL SELECTION
TRUE
TRUE OR FALSE Remote islands are inhabited by unique species that are descended from a few individuals who were able to reach the island AND IS AN OUTCOME OF NATURAL SELECTION
TRUE
WHAT DID DARWIN CALL HIS IDEAS FOR SPEICES AFTER HIS VOYAGE ON THE BEAGLE
“transmutation of species”
Whaat are some peices of evidence that prove evolution?
-Fossils
-homolguous structures
- biogeography
-direct observation
Fossils
- how animals are incrediabily similar
-homoguous structures
- many organisms share similiar traits
- can also show us how we are related
biogeography
- animals thata re the most similar and most closely realted tend to be found in the same reigons beacuse the evolutaionary change is driven by geographical change
direct observartion
-we can directly see the resistance of drugs to chemicals
-bugs are becoming resistant to pesticides
microevolution
-allele frequency changes that haooen quickly and in small populations
macroevolution
changes that occur over a large period of time
Two theories of evolution
- all living organims eveolved form a common ancestor
- evoltuion is [owered by natural procceses
other ways to prove evolution
embrology- how creatures devlope
compartive anatomy- comparing and finding similarities between living things
DNA- Resrachers can compare DNA code
vestigial features-
features that have little to no function
anatomcial oddities-
they are atypical variations
-i.e extra toe
homologuous features
-struture with common evolutioanry orgigin that may serve different function in modern speices
-closely related species had homologous features as they shared common ancestors
analoguous features
- Analogous structures are features of different species that are similar in function but not necessarily in structure and which do not derive from a common ancestral feature
Competition within Populations
Malthus showed that all populations were limited in size by their
environment—and in particular their food supply. Whatever the conditions, populations could not continue to grow indefinitely
Th ere is a limit to the size of the population that an environment can support. Th e result is competition for survival between
members of the same species.
