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LO: SWBAT describe what selective
breeding is, give examples of
selective breeding and compare it to
genetic engineering.
DN: If you have a cloned flock of
sheep, can you breed the sheep within
that cloned flock? Explain.
HW: page 339 #20
Thurs: read pp 322-325, page 339 #18-19
Fri: Review Book- Respiration
What is Breeding?
To produce offspring
What is meant by being
Selective?
What music do you like?
The power to choose or
pick out from among others.
Can you now define Selective
Breeding?
The process of choosing a few
organisms with desirable traits to serve
as the parents of the next generation.
Types of Selective Breeding:
Hybridization/Crossbreeding: is the
process of crossing __________
dissimilar
individuals to bring together the
best of both organisms.
_____
+
Real Example of Hybridization:
Hybrid
+
=
Horse
Donkey
Mule
Big, Fast,
Excitable
Small, Slow,
Calm
Strong,Calm
Endurance
The hybrid is often stronger and hardier
than its parents: Hybrid Vigor
Burbank’s hybrid crosses
disease
combined the ________
resistance of one plant
__________
with the ______________
food-producing
_________
capacity of another.
1872 - American horticulturist Luther Burbank
(1849-1926) developed a special potato.
Burbank, while trying to improve the Irish
potato, developed a hybrid that was
more__________________
. He introduced the
disease resistant
Burbank potato to Ireland to help combat the
blight epidemic.
Inbreeding: is the continued breeding
of organisms with ________
similar
characteristics.
Breeders try to maintain certain
________________.
characteristics
Inbreeding:
Advantages:
desirable traits, like resistance to
disease, strength of an organism
are collected
Disadvantages:
recessive disorders tend to
increase, undesired traits are
expressed.
Risks of Inbreeding:
What is a Recessive
Disorder?
An inherited disorder
that occurs when the
offspring receives
a “bad” gene from each
parent.
1 out of 27 Jewish
people are carriers for Tay-Sachs Disease
this disease.
Mass Selection: is choosing the best
___________________
plants and animals from a large
number for further _________.
breeding
What are some benefits
of selective breeding?
1)Produce crops resistant to ________.
disease
2) Produce crops that are _______.
bigger
3)Produce animals that have less ____.
fat
4) _________
Seedless fruit!!!
Genetic Engineering vs.
Selective Breeding:
Genetic engineering
requires the altering of
genes to get desired
characteristics.
Selective Breeding
utilizes natural
reproduction to get
desired characteristics.