Sexual
Selection
SLIDE 30
M a i n Points
A form of natural selection.
Traits increase mating
success.
Can produce exaggerated
characteristics.
E x a m p l e s
Peacock
tail Deer
antlers
Bird
courtship
dances
Some traits evolve not because they improve survival but because they increase reproductive success. Bright feathers,
impressive antlers, or elaborate mating behaviors may help individuals attract mates or compete with rivals, allowing
these traits to spread through populations.
, H u m a n
Evolution
SLIDE 31
M a i n Points
Humans evolved from earlier primates.
Share common ancestry with
chimpanzees. Evolution occurred over
millions of years.
Important
0 0
H
1
o m i n i n s 2
Australopithec H o m o
us habilis
0 0
3 4
H o m o erectus H o m o s apien s
Human evolution is well documented through fossils and DNA evidence. Rather than evolving from modern apes,
humans and chimpanzees share a common ancestor that lived millions of years ago. Over time, early human
ancestors developed larger brains, upright walking, and advanced tool use.
Selection
SLIDE 30
M a i n Points
A form of natural selection.
Traits increase mating
success.
Can produce exaggerated
characteristics.
E x a m p l e s
Peacock
tail Deer
antlers
Bird
courtship
dances
Some traits evolve not because they improve survival but because they increase reproductive success. Bright feathers,
impressive antlers, or elaborate mating behaviors may help individuals attract mates or compete with rivals, allowing
these traits to spread through populations.
, H u m a n
Evolution
SLIDE 31
M a i n Points
Humans evolved from earlier primates.
Share common ancestry with
chimpanzees. Evolution occurred over
millions of years.
Important
0 0
H
1
o m i n i n s 2
Australopithec H o m o
us habilis
0 0
3 4
H o m o erectus H o m o s apien s
Human evolution is well documented through fossils and DNA evidence. Rather than evolving from modern apes,
humans and chimpanzees share a common ancestor that lived millions of years ago. Over time, early human
ancestors developed larger brains, upright walking, and advanced tool use.
