Download Evidence for Evolution

Learning Targets:
Evidence for Evolution
 Review of Natural Selection
 Remember Darwin came up with the Theory of Evolution.
 Natural selection leads to_________________________________ – traits
are passed down from generation to generation and sometimes undergo
changes or modifications over time
Evidence for Evolution

________________________________________________________________
 Shows change over time.
 Fossils of extinct species provide evidence of shared ancestry and how
organisms and the environment have changed over time.

________________________________________________________________
 Differences and similarities between organisms in different locations
around the world.
 Provides evidence of how modern species share a common ancestor but
have evolved to fit environments in different locations.
 ___________________________________________________________
 comparing body structures, similarities and differences.
 ___________________________________________________________
 comparing protein & DNA sequences.
 The greater the similarities in DNA and protein sequences, the
more likely two organisms share a common ancestor.
 ________________________________________(ATGC) provides
evidence that ALL life forms are related.
 ___________________________________________________________
 comparison of stages of embryonic development between
organisms of different species.
 Embryos of closely related species have similar stages of
development.
Anatomical Structures
 ___________________________________________________-structures
that come from the same origin, but have different functions.
 homo- = same
 -logous = information
 Forelimbs of human, cats, whales, & bats
 ______________________________________________________
 on the inside
 ______________________________________________________
 different functions
 on the outside
 ______________________________________________________
 Divergent Evolution (similar ancestor, but due to isolated
environments evolve to adapt best to environment)
 __________________________________________________- structures
that have a similar function but do NOT have similar internal structure.
 ______________________________________________________
 on the outside
 ______________________________________________________
 ______________________________________________________
 on the inside
 ______________________________________________________
 ______________________________________________________
 Convergent Evolution (similar living environments, adapted in
similar way).
 Convergent evolution (Analogous structures)-evolving similar
solutions to similar problems.
 ________________________________________________: Remnants of
structures that may have had important functions in an ancestral species
but have no clear function in the modern species  shows common
ancestry with adaptations to changing environments.
Summary: