Notes: Ch.6-2 Clues About Evolution
EQ:
Fossils
Most of the _____________ for ____________________ comes from _________________
A _________________ is the ________________, an ________________, or a ___________ of a prehistoric organism.
The ____________ ____________ provides evidence that living things could have __________________.
Determining a Fossil’s Age
_____________________ use clues provided by unique rock layers and the __________ they contain.
The clues provide information about the ___________, ________________, and like-forms that must have been present
during each __________________ time ________________.
_________ basic methods for ________________ fossils– _________________________ and
_________________________ – usually used together to help estimate the age of the ___________ and ______________
Relative Dating
________________________ is based on the idea that in _____________________ areas, _________________ rock
layers are ___________________ on _____________ of _________________ rock layers.
_______________ dating provides only an _________________ of a fossil’s age.
Radiometric Dating
__________________ can obtain a more accurate __________________ of the ____________ of a rock layer by using
______________________ elements.
A ____________________ element gives off a steady amount of ______________________ as it slowly changes to a
____________________ element.
More Clues about Evolution
Plant breeders observe ________________ when they use ___________________________ to produce
_______________ changes in plants.
The development of antibiotic resistance in bacteria
Similarities in embryo _______________________, the _____________________________ of organisms including
___________, and the way organisms develop into adults
Embryology
The study of __________________ and their _______________________ is called embryology.
____________ develop _____________, but the other organisms develop other _________________ as their
development continues
_____________, _________________ and _______________ keep their tails, but many _________________ lose theirs.
These ________________________ suggest an evolutionary relationship among all vertebrate species.
Homologous Structures
_____________ parts that are similar in origin and __________________ are called ___________________________.
___________________ structures also can be similar in function.
They often indicate that two or more ______________________ share common ________________________
List some examples of Homologous structures:
Analogous Structures
___________ parts that are ______________ in _____________ but may not have exactly the same ______________
List some example of Analogous structures:
Vestigial Structures
The _______________ of some organisms include __________________ structures – _________________ that don’t
seem to have a _________________.
Vestigial structures also provide evidence for evolution.
The ______________ ______________________ is a vestigial structure
Scientists _______________________ that __________________ structures are _____________ parts that once
__________________ in an ancestor
DNA
_______________ DNA also can suggest _____________________ __________________.
Looking at _________________ and ________________ interactions we can look at how __________________ genes
________________ from species to species and find _____________________________.
This is also used as another clue for evolution.