Download evolution

evolution:
-change over time
Evolution (Darwin’s
Theory):
-modern organisms
came from ancient
organisms
 Darwin’s observations:
 -diversity in similar ecosystems
 -living organisms look like fossils
 -Galapagos Islands
Darwin’s Finches
-13 species 1
common ancestor
-uniquely adapted
to its habitat
-difference in
beak shape & size
 Adaptation- inherited characteristic that
increases an organism’s chance for survival
 physical/behavioral
 Survival of the Fittest- individuals with the most
successful adaptations survive and reproduce more
successfully
 Natural Selection- changes in the inherited
characteristics of a population & increases a species’
fitness in its environment
Fitness
Ability to survive and reproduce!
Checking For Understanding
What is a polar bear’s white fur
considered?
ADAPTATION
What is the ability to survive and
reproduce considered?
FITNESS
Checking for Understanding
What is this animal’s adaptation?
Bill
Checking for Understanding
What is change over time?
EVOLUTION
Fill in the blank..
Darwin theorized that ____ organisms
came from ancient organism.
MODERN
Checking for Understanding
Darwin studied what kind of birds on the
Galapagos Islands?
FINCHES
Changes in the inherited characteristics of
an entire species is considered what?
NATURAL SELECTION
Evidence for Evolution
Turn to pg. 108
Title the Page “Evidence for
Evolution”
Divide the page into roughly 9
boxes.
Number the boxes 1-9.
#1
1. Fossil Record
-evidence of changing
life forms over millions
of years
#2
Homologous Structures-similar structures
arising from a common ancestor
#3 Analogous Structures
 Same function but no common ancestry
#4 Checking for Understanding
A human forearm to a cat’s forelimb is
considered what?
HOMOLOGOUS
A butterfly’s wing to a bird’s wing is
considered what?
ANALOGOUS
#5 Similar
Embryology:
 Vertebrates form
in the same way in
early stages of
development.
#6-Vestigial Structures
 No function, and resembled other
organisms
Ex: coccyx (human tail bone),
Appendix
#7Checking for Understanding
What serves as evidence that life forms
have been changing for millions of
years?
FOSSIL RECORD
#8 Checking for Understanding
What proves that vertebrates develop in
the same way early on?
SIMILAR EMBRYOLOGY
#9 CLOSURE ACTIVITY
How does an adaptation relate to survival
of the fittest?
Those most fit to survive has the most
successful adaptations, otherwise
inherited characteristics.