Transcript Natural Selection vs. Selective Breeding

Natural Selection
vs.
Selective Breeding
Environmental and Human Influences
Natural Selection Selective Breeding
 Process
by which
organisms that are
most suited to
their environment
survive and
reproduce most
successfully.
 Method
of breeding
that allows only
those organisms
with desired
characteristics to
produce the next
generation.
Natural Selection vs. Selective Breeding
Let’s Review

Do you remember these guys?
The adaptation of a population in response
to pollution.

“Industrial Melanism”- darkness- of the skin,
feathers, or fur. Acquired by a population of
animals living in an industrial region where the
environment is soot-darkened.
Example: Peppered Moths
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
Manchester, England from
1845 to 1890.
Before the industrial
revolution, the trunks of the
trees in the forest around
Manchester were light
grayish-green due to the
presence of lichens.
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Most of the peppered
moths in the area were light
colored with dark spots.
As the industrial revolution
progressed, the tree trunks
became covered with soot
and turned dark.
Over a period of 45 years,
the dark variety of the
peppered moth became
more common.
Can you see the moths?
NATURAL
SELECTION
Summary: Environmental
Influence due to organism
adaptation.
Mouth parts
ex: beaks, teeth
 External color
ex: fur, scales, feathers
 Behavior

Galapagos Islands
1850’s: Charles
Darwin described
how organisms might
change over time.
 Theory of Evolution
 5 years of
observations on the
islands.

Galapagos
Finches
SELECTIVE
BREEDING
Summary: Human Influence
on characteristics and
behavior.

Domestic Animals
◦ Ex: Chickens, Dogs, Cows

Plants:
◦ Ex: Corn, Brasilica, Fruit
hybrids
Domestic Animals

Various animals that have been tamed and
made fit for a human environment.
HYBRID FRUITS
Nectarcots
 Pluots
 How many
types of apples
are there?
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