Transcript Natural Selection and Selective Breeding Notes

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
Natural Selection
Nature selecting some organisms to
live and others to die.
Reproduction
Variation
Competition
Survival
Fittest: Lives long enough to reproduce
Let’s Review
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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.



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
https://www.youtube.com/watch?v=W_CnR0A
k604&index=2&list=PLgr6dnNbT5pG7CKfkScfNEDWjeUZr9FI
Domestic Animals

Various animals that have been tamed and
made fit for a human environment.

http://www.discovery.com/tv-shows/othershows/videos/assignment-discovery-shortsartificial-selection/
HYBRID FRUITS
Nectarcots
 Pluots
 How many
types of apples
are there?
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