Transcript Natural Selection applied2016x

DO NOW:


Homework on desk.
Examine the data. On the back of the homework
page, explain how and why the population may
have changed from year 1 to year 10.
CHARLES DARWIN AND
NATURAL SELECTION
Objectives:
1)
To explain Darwin’s theories
of evolution by natural
selection
2)
To discuss descent with
modification
I. CHARLES DARWIN
A. “Father of Evolution”
B. Darwin’s key contribution: Mechanism
on how evolution could occur called
NATURAL SELECTION
II. DARWIN’S THEORY OF EVOLUTION BY
NATURAL SELECTION
A. Over time, the number
of individuals that carry
advantageous traits will
increase in a population
B. Occurs in 4 steps…
DARWIN’S THEORY OF EVOLUTION BY
NATURAL SELECTION…
1. Living things overproduce
DARWIN’S THEORY OF EVOLUTION BY
NATURAL SELECTION…
2. There is variation among offspring
DARWIN’S THEORY OF EVOLUTION BY
NATURAL SELECTION…
3. There is a struggle to survive
DARWIN’S THEORY OF EVOLUTION BY
NATURAL SELECTION…
4. Those that survive are most fit
III. NATURAL SELECTION:
“SURVIVAL OF THE FITTEST”
A. Fitness = ability to survive and
reproduce
B. Fitness is the result of adaptations –
inherited characteristics that increase an
organism’s chance of survival
ADAPTATIONS:
IV. KEY THINGS TO REMEMBER:
A. Evolution is NOT BASED ON
NEED
B. If environments change,
organisms DO NOT HAVE TO
ADAPT!
 Many
organisms become extinct
HOW DO WE GET NEW SPECIES?
V. DESCENT WITH MODIFICATION
A. Over time, natural selection produces
organisms with different structures
B. Today’s species look different from their
ancestors
C. Each species descended with changes
over time
1965
1975
FORD MUSTANG
2005
1985
2015
1995
FORD MUSTANGS ARE VERY DIFFERENT
FROM THEIR ANCESTOR: THE MODEL T
DESCENT WITH MODIFICATION
D. Implies that all living things are
related to one another
E. COMMON ANCESTOR