This minimal slide will illustrate and explain the theory of natural selection.

1. NATURAL SELECTION
S C I E N T I F I C T H E O R Y

2. s c i e n t i f i c t h e o r y t o e x p l a i n h o w t h e d i v e r s i t y o f
l i f e w i t h s o m a n y s p e c i e s a n d l a rg e v a r i a t i o n s
i n c h a r a c t e r s c a m e t o e x i s t .
NATURAL SELECTION

3. THE CONCEPT OF
NATURAL SELECTION
f o r m u l a t e d b y C h a r l e s D a r w i n (1 8 0 9 – 8 2 )
o p e r a t e s w h e n i n d i v i d u a l s d i f f e r i n h e r i t a b l e t r a i t s t h a t
re s u l t i n d i f f e re n c e s i n t h e i r re l a t i v e c o n t r i b u t i o n o f
o f f s p r i n g t o t h e n e x t g e n e r a t i o n .
t r a i t s t h a t b e n e f i t a n o rg a n i s m t o m a x i m i z e i t s b i o l o g i c a l
f i t n e s s u n d e r t h e p re v a i l i n g e n v i ro n m e n t a l c o n d i t i o n s w i l l
s p re a d i n a p o p u l a t i o n a n d f u n c t i o n a s a d a p t a t i o n s .

4. DARWIN’S THEORY
C h a r l e s D a r w i n w ro t e “O n t h e O r i g i n o f
S p e c i e s ”. I n i t , h e p ro p o s e d t h a t s p e c i e s e v o l v e
a n d t h a t a l l l i v i n g t h i n g s c a n t r a c e t h e i r
d e s c e n t t o a c o m m o n a n c e s t o r.

5. DARWIN’S THEORY
a m e c h a n i s m f o r e v o l u t i o n : n a t u r a l s e l e c t i o n , w h i c h
h e r i t a b l e t r a i t s t h a t h e l p o rg a n i s m s s u r v i v e a n d re p ro d u c e
b e c o m e m o re c o m m o n i n a p o p u l a t i o n o v e r t i m e , w h i c h
w a s b a s e d o n h i s o b s e r v a t i o n t h a t o f f s p r i n g v a r y i n t h e i r
h e r i t a b l e t r a i t s , m a k i n g t h e m s l i g h t l y d i f f e re n t f ro m o n e
a n o t h e r a n d m a n y o f t h e s e f e a t u re s w i l l b e h e r i t a b l e .

6. SPEEDING UP
NATURAL SELECTION
POPULATION
PRESSURE
harder for organisms
to survive, resulting in
more members of a
population die before
reproducing. Those
with traits to deal with
the pressures will
survive and pass to
the next generation.
POPULATION
BOTTLENECK
Removing large
percentage of a
population leave
individuals with rare
alleles that differ from
the larger population,
making them become
the average for the
population.
FOUNDER EFFECT
small individuals
migrate to a new
location, founding a
new population that
not mates with old
population, which
lead to subsequent
generations have
different traits from
the original.

7. THANK YOU