Selective Breeding

1
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
2
What is Breeding?
To produce offspring
3
What is meant by being Selective?
What music do you like?
The power to choose or pick out from among
others.
4
Can you now define SelectiveBreeding?

• The process of choosing a few organisms with
  desirable traits to serve as the parents of the
  next generation.

5
Types of Selective Breeding

• Hybridization/Crossbreeding is the process of
  crossing __________ individuals to bring together
  the _____ of both organisms.

dissimilar
best

6
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
7
Burbanks hybrid crosses combined the ________
__________ of one plant with the ______________
_________ of another.
disease
resistance
food-producing
capacity
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 Burbank potato to Ireland to
help combat the blight epidemic.
disease resistant
8
Inbreeding is the continued breeding of
organisms with ________ characteristics.
similar
Breeders try to maintain certain ________________.
characteristics
9
Inbreeding
Advantages
desirable traits, like resistance to disease,
strength of an organism are collected
Disadvantages
recessive disorders tend to increase, undesired
traits are expressed.
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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 this
disease.
Tay-Sachs Disease
11
Mass Selection is choosing the best
___________________ from a large number for
further _________.
plants and animals
breeding
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What are some benefitsof selective breeding?

1. Produce crops resistant to ________.

disease
2) Produce crops that are _______.
bigger

1. Produce animals that have less ____.

fat
4) _________ fruit!!!
Seedless
13
Genetic Engineering vs. Selective Breeding
Selective Breeding utilizes natural reproduction
to get desired characteristics.
Genetic engineering requires the altering of
genes to get desired characteristics.