science

1. Evidence of Evolution

2. Go to www.menti.com
 USE THE CODE:
8117068
 In 1 minute, write 3 words you
know about evolution

3. DO YOU BELIEVE THAT WE EVOLVE
FROM APES/CHIMPANZEES?

4. Evidence of Evolution
 EVOLUTION - genetic change in a
population of organisms over time
 4 Types of Evidence that scientists have
gathered in support of evolution
 Fossils
 Comparative Anatomy & Structures
 Embryology
 Biochemistry (Proteins & DNA)

5. Fossils
 What is a FOSSIL?
 The preserved remains or traces of
an organism that is no longer living
 Usually found in
sedimentary rocks

6. What can fossils show?
 Organisms have appeared and
disappeared, and have changed over
time
 Extinction of species
 Reveals ancient climate &
environmental conditions
 Indicates development of life from
simple to complex
 Indicates life began in water

7. Comparative Anatomy
 Study of anatomical structures to find
similarities and differences
 3 TYPES:
 HOMOLOGOUS STRUCTURES –
parts with similar basic structure
(derived from same structures in
embryo—same common descent),
but may vary in function

8.  the arm of a human; the fin of a
whale; the wing of a bat; and the
foot of the cat

9.  ANALOGOUS STRUCTURES – structures
that have the same function (may look
somewhat alike), but have different
structures and DO NOT have a common
descent
Example: wings have developed
independently in insects, reptiles, birds,
and bats

10.  VESTIGIAL STRUCTURES – reduced
body parts (in comparison to the same
complex structure in other organisms)
that have little to no function; remnant of
an ancestor
 Examples:
Human appendix (other mammals
it is necessary to aid in digestion)
Bird wings – Penguins adapted for
swimming, ostrich wings for
balance and courtship

11. Embryology
 Patterns of embryological
development can indicate a common
ancestry
 Fish, birds, mammals & reptiles all
have gills; only fish retain theirs

12. HUMAN CHICKE
N
RABBIT TORTOI
SE
SALAMA
NDER
FISH

14. Biochemical Similarities
 Similarity of proteins, RNA & DNA
molecules
 The more closely related organisms
are, the more similar is the
biochemical makeup
 Indicates common ancestor
 Universality of genetic code –
supports evolution

15. DO YOU BELIEVE THAT WE
EVOLVE FROM
APES/CHIMPANZEES?

16. Humans are not descended from
monkeys or any other primate living
today. We do share a
common ape ancestor
with chimpanzees. It lived between
8 and 6 million years ago.
But humans and chimpanzees
evolved differently from that same
ancestor.

17. ASYNCHOROUNS TIME
 ANSWER the worksheet given

18. THANK YOU AND STAY SAFE