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?

The power to choose or pick out from among others.

What music do you like?

Can you now define SelectiveBreeding?

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 Donkey MuleBig, Fast,Excitable

Small, Slow,Calm

Strong,CalmEndurance

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

diseaseresistance

food-producingcapacity

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 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.

Mass Selection: is choosing the best ___________________ from a large number for further _________.plants and animals

breeding

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

Genetic Engineering vs. Selective Breeding:

Genetic engineering requires the altering of

genes to get desired characteristics.

Selective Breeding utilizes natural

reproduction to getdesired characteristics.