Presentation on theme: "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."— Presentation transcript:
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 meant by being Selective? The power to choose or pick out from among others. What music do you like?
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 __________ individuals to bring together the _____ of both organisms. + dissimilar best
Real Example of Hybridization: + = Horse DonkeyMule Big, Fast, Excitable Small, Slow, Calm Strong,Calm Endurance The hybrid is often stronger and hardier than its parents: Hybrid Vigor Hybrid
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 disease resistance food-producing capacity
Inbreeding: is the continued breeding of organisms with ________ characteristics. Breeders try to maintain certain ________________. similar characteristics
Inbreeding: Advantages: Disadvantages: desirable traits, like resistance to disease, strength of an organism are collected recessive disorders tend to increase, undesired traits are expressed.
Risks of Inbreeding: What is a Recessive Disorder? Tay-Sachs Disease 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.
Mass Selection: is choosing the best ___________________ from a large number for further _________. plants and animals breeding
What are some benefits of selective breeding? 1)Produce crops resistant to ________. 2) Produce crops that are _______. 3)Produce animals that have less ____. 4) _________ fruit!!! disease bigger fat Seedless
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.