genetically modified organisms (gmos) learning target: 1
TRANSCRIPT
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Genetically Modified Organisms (GMOs)
Learning Target:
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Genetic EngineeringI Can… Describe, in general terms, how
the genetic information of an organism can be altered to give the organism new genetically based traits. I Will…• List examples of cloning of organisms
occurring in nature.• Briefly describe the steps of Somatic
Cell Nuclear Transfer (SCNT) in cloning mammals
• Connect the structure of DNA and process of protein synthesis with reasons why genetic engineering is possible.
• List the steps necessary to produce a transgenic organism
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Genetic EngineeringKEY CONCEPT:
• DNA sequences of organisms can be changed.• Entire organisms can be cloned• New genes can be added to an
organism’s DNA• Genetic engineering produces
organisms with new traits
Principles of genetics and cellular chemistry can be used to produce new foods and medicines in biotechnological processes.
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• Plants • Clone themselves from roots, stems and leaves• Plant tissue contains many stem cells that can develop into many types of cells
Clone:• genetically identical copy of a gene or an organism
Cloning occurs in nature:
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Bacteria:• Clone themselves during asexual reproduction through binary fission
Cloning occurs in nature:
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Simple Animals:• Clone themselves during asexual reproduction through budding e.g. Hydra• Clone themselves during regeneration e.g. sea star
Cloning occurs in nature:
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Cloning mammals – more difficult
Somatic Cell Nuclear Transfer (SCNT)• Haploid nucleus removed from
unfertilized egg gamete cell• Diploid nucleus from somatic cell
inserted into the egg cell• Stimulated (chemicals and
electricity) to go through mitosis and start dividing
• Embryonic bastocyst (mass of cells) implanted in uterus
• Develops into cloned offspring23 46
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First clone of an adult mammal:
• Dolly the sheep (1977)
• Many other mammals cloned
since
• Biotechnology
companies
clone beloved
pets
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Rainbow – Somatic cell DNA
CC – Cloned/Carbon Cat
Allie – Surrogate mom
Egg donor– Anonymous
Many Factors affect gene expression – Epistasis, Inactivation, Methylation, … • Epigenetics
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Cloning: ControversialPros
• Creation of personal stem cells
• Organ transplant
• Treat diseases
• Spinal cord injuries
• Save endangered species
Cons• Low success
rate• Expensive• Health issues
in clone• Reduces
biodiversity• Ethic of
“creating” life• When does
life begin?
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Genetic Engineering:• Changing and adding genes to
an organism’s DNA to give it new traits• Clones genes not whole
organisms
How and why can we do this?
DNA is UNIVERSAL!• DNA – 4 common nucleotides
(A,T,G,& C)• DNA – Common double helix
structure• RNA – Common 4 nucleotides (A, U,
G, & C)• Codons – code for 20 common amino
acids the make proteins
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Genetic engineering is based on:• Recombinant DNA• DNA that contains genes
from more than one organism• Engineer crops to be
resistant to cold or insects• Engineer crops to produce
vitamins or medicines• Engineer bacteria to
produce medicines or enzymes
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Bacterial plasmids are often used to make recombinant DNAPlasmid - closed loop of DNA in bacteria separate from the bacterial chromosome• Will
replicate on its own within the cell
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Transgenic organism - has one or more genes from another organism inserted into its genome Transgenic bacteria used to make human insulin:• Gene
inserted into plasmid
• Plasmid inserted into bacteria
• Bacteria expresses gene
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Transgenic plants are common in agriculture:
• Transgenic bacteria infect a plant
• Plant expresses foreign gene
• Many crops are now genetically modified (GM / GMO -organism)
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Scientists have concerns about some uses of genetic engineering:• Possible long-term health effects
of eating GM foods• Allergies• Diseases
• Possible effects of GM plants on ecosystem and biodiversity• Keystone species cascade
effect• New vulnerabilities of
engineered organismhttp://webertube.com/mediadetails.php?mid=8468&
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Genetically Modified Organisms (GMOs)
Learning Check :
List 4 reasons why genetic engineering is possible
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Learning Check :List 4 reasons why genetic engineering is possible
Name: ___________________
Name: ___________________
Name: ___________________
Name: ___________________
Learning Check :
Learning Check :
Learning Check :
List 4 reasons why genetic engineering is possible
List 4 reasons why genetic engineering is possible
List 4 reasons why genetic engineering is possible