CHAPTERS 5.11 TO 5.13 BIOTECHNOLOGY Ms. Doshi

Introduction to Biotechnology FxznM9TRFY

Biotechnology - to change organisms, cells, and other molecules to achieve practical benefits genetic engineering -change an organism’s genetic material by adding, deleting or transplanting genes from one organism to another Biotechnology involves genetic engineering.

Five Tools of Biotechnology Not all tools are used in Biotechnology applications- some use only 1 or few of these. CHOP=CUT AMPLIFY=MAKE MORE INSERT=INSERT GROW=GROW IDENTIFY=IDENTIFY

CHOP DNA Use Restriction Enzymes to chop DNA Restriction Enzymes  recognize specific DNA sequences  the sequence depends on the type of restriction enzyme used  cut DNA into small pieces

AMPLIFY DNA PCR is used to make more of the same DNA, when you only have a small amount of it. Used in crime scene processing if DNA is found at the scene.

INSERT DNA 1.Isolate gene of interest using restriction enzyme (RE) 2.Using same RE, cut plasmid. 3.Plasmid DNA and gene of interest join together. 4.Put plasmid (with gene of interest) back in bacteria or virus to be replicated. 5.Now, you have created a transgenic organism (an organism with DNA from a different species).

GROW: Creating a gene library Create a collection of cloned DNA.

IDENTIFY: Use a DNA probe 1.Break double stranded DNA into single stranded DNA 2.Add radioactive probe (a short piece of DNA that is complimentary to the gene of interest) 3.DNA binds to gene of interest and glows with radioactivity.

Questions 1.Define biotechnology. 2.Define genetic engineering. 3.What are the 5 tools of biotechnology? 4.How do you chop DNA? 5.How do you amplify DNA? 6.How do you insert DNA? 7.How do you identify DNA? 8.How do you grow DNA?

GMOs In the past, to create the best product, farmers had to wait many generations. Now, farmers use recombinant DNA technology to create genetically modified organisms (GMOs). Recombinant DNA technology is when DNA is combined from 2 or more sources into a product.

Vitamin A in Golden Rice Low Vitamin A leads to BLINDNESS Low Vitamin A in children in southern Asia and sub-Saharan Africa. Diet in southern Asia and sub-Saharan Africa includes rice. Vitamin A comes from Beta-Carotene Solution: Add Beta-Carotene genes to rice and make ‘golden rice’. Add 2 genes from daffodils and 1 gene from bacteria to white rice DNA.

Genetically Modified Crops in the USA

Why are many crops genetically modified in the USA? 1. Many plants have insecticides genetically engineered into them. 2. Many plants have herbicide-resistance genes engineered into them. Both reduce the cost of making food and reduce loss of topsoil to erosion.

Bt Corn Bacillus thuringiensis (Bt) These bacteria produce spores containing crystals that are poisonous to insects but harmless to crop plants and to people. The Bt crystal gene is put in plants to kill caterpillars.

Bigger Salmon A transgenic Atlantic salmon has been created. It carries a growth hormone gene from a Chinook salmon and a region of DNA from an Ocean Pout that is an “on” switch, allowing transcription of the growth hormone. The salmon tastes the same as the original Atlantic salmon and reaches its full size in 18 months.

Fears and Risks of GMOs Organisms that we want to kill may become invincible. -In Canada, pesticide-resistant Canola plants are growing out of control. Organisms that we don’t want to kill may be killed inadvertently. -Monarch butterflies can be killed from Bt pollen that land on milkweed plants. Genetically modified crops are not tested or regulated adequately. -not sure of new risks Eating genetically modified foods is dangerous. -In the 1990s, a gene from Brazilian nuts was put in soybeans. As a result, people became allergic to soybeans. Production of these soybeans stopped. Loss of genetic diversity among crop plants is risky. -This can make crops vulnerable to environmental changes or pests. Example: The potato famine. Hidden costs may reduce the financial advantages of genetically modified crops. -Need to buy new seeds for each generation of crops.

Questions 1.What is a GMO? 2.What is DNA Recombinant Technology? 3.What genes are used to make Vitamin A in Golden Rice? 4.What percent of corn is genetically modified? 5.What percent of soybeans are genetically modified? 6.What percent of cotton is genetically modified? 7.Why are many crops genetically modified in the USA? 8.What is Bt corn? 9.What does Bt do? 10.Where do the genes come from in the transgenic Atlantic Salmon?

Any Questions? Any Answers? Any Comments?