lo: swbat describe what selective breeding is, give examples of selective breeding and compare it to...
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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
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What is Breeding?
To produce offspring
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What is meant by being Selective?
The power to choose or pick out from among others.
What music do you like?
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Can you now define SelectiveBreeding?
The process of choosing a few organisms with desirable traits to serve as the parents of the next generation.
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Types of Selective Breeding:Hybridization/Crossbreeding: is the process
of crossing __________ individuals to bring together the _____ of both
organisms.
+
dissimilar
best
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Real Example of Hybridization:
+ =
Horse Donkey MuleBig, Fast,Excitable
Small, Slow,Calm
Strong,CalmEndurance
The hybrid is often stronger and hardier than its parents: Hybrid Vigor
Hybrid
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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.
Burbank’s hybrid crosses combined the ________
__________ of one plant with the ______________
_________ of another.
disease resistant
diseaseresistance
food-producingcapacity
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Inbreeding: is the continued breeding of organisms with ________ characteristics.
Breeders try to maintain certain ________________.
similar
characteristics
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Inbreeding:
Advantages:
Disadvantages:
desirable traits, like resistance to disease, strength of an organism are collected
recessive disorders tend to increase, undesired traits are expressed.
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Risks of Inbreeding:What is a RecessiveDisorder?
Tay-Sachs Disease
An inherited disorder that occurs when theoffspring receives a “bad” gene from eachparent.
1 out of 27 Jewish people are carriers for
this disease.
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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 ________.
2) Produce crops that are _______.
3)Produce animals that have less ____.
4) _________ fruit!!!
disease
bigger
fat
Seedless
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Genetic Engineering vs. Selective Breeding:
Genetic engineering requires the altering of
genes to get desired characteristics.
Selective Breeding utilizes natural
reproduction to getdesired characteristics.