evidence of rvolution Flashcards
How do we know things have
evolved in the past?:
➢
Fossils
➢Biogeography
➢Anatomy
➢Embryology
➢DNA
what are fossils
trace of organism of past geologic ages thats was preserved in earth’s crust
what is Fossil Record
→
mineralized remains of a living organism
what are Transitional Fossils and example
➢ Fossils that show links between groups of organisms
➢ Link the past with the present
archaeopteryx fossils
explain Biogeography
study of the past and present geographical distribution of organisms
where do organisms on islands evolve from
evolve from mainland migrants
define Homologous Features
and example s
Structures with similar origin but different functions
forelimbs of bat wing and human
define Analogous structures
and example
A structure with similar function but different structure
wings in birds bats and insects
jointed legs of insects
fish
what are Vestigial Structures
and example
• Remains of structure that had a purpose but don’t anymore
pelvic bone in dorudon whale
appendix
dog and cat fifth toe
what is Embryology
-Homologous structures in embryos -means theres common ancestral origin
All vertebrates have a bony tail and gill slits in early development
what does comparison pf DNA and proteins show
relatedness of organisms
what does it mean If two species have similar DNA sequences,
sequences are inherited from
a common ancestor
what does it mean to have fewer differenceses in DNA
more related
The degree of similarity between DNA base sequences and
amino acid sequences in two organisms is thought to
indicate their degree of
relatedness
