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Transcript of Genetic Engineering Chapter 13 Selective Breeding Choosing the BEST traits for breeding. Most...
![Page 1: Genetic Engineering Chapter 13 Selective Breeding Choosing the BEST traits for breeding. Most domesticated animals are products of SB. Also known as:](https://reader035.fdocuments.net/reader035/viewer/2022070408/56649e565503460f94b4d5d1/html5/thumbnails/1.jpg)
Genetic Engineering
Chapter 13
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Selective Breeding
• Choosing the BEST traits for breeding.
• Most domesticated animals are products of SB.
• Also known as: Artificial Selection
• Techniques used in SB:
1. Hybridization
2. Inbreeding
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HORSES
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• Crossing dissimilar individuals to bring together the best traits of both organisms
• Produces hybrids
• * Hybrids can be different species crossed together or different types within the same species.
Hybridization
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Golden Doodle and Puggle
Designer breeds or mutts?
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Can you think of other fruit or
vegetable hybrids?
PluotBroccoflower
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Inbreeding Domesticated animals and plants are inbred to develop
“breeds” and “varieties.” Researchers use inbred strains to assure genetic
similarities in their experiments. Problems: it can increase the chance of unfavorable
traits showing up. Golden retrievers - epilepsy Dalmations - hereditary deafness
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Increasing Variation
Breeders can increase variation in a population by inducing mutations Mutation = any change in DNA
Mutations can happen randomly, as in this Scottish fold cat. Cat enthusiasts bred these cats from a single cat with a mutation for the ears.
A new strain of Oil-eating bacteria was produced.
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Mutations can produce new kinds of plantsEx: Plants can sustain multiple sets of
chromosomes - Polyploidy.
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Manipulating DNA• Making any changes in the DNA code is:
Genetic Engineering
How DNA is Manipulated:• Extract DNA from cells• Cut DNA into smaller pieces (Restriction
enzymes)• Identify the sequence of bases in a DNA
molecule (Gel electrophoresis)• Make unlimited copies of DNA strands(PCR)• Combining different strands of DNA from
different organisms (recombinant DNA)
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Transgenic Organisms
Definition: Organisms that contain genes from another organism.
Transgenic microorganisms – bacteria that produce human insulin.
Transgenic plants – major part of US agriculture; weed resistance; insecticides
Transgenic animals – growth hormones in livestock, resistance to bacterial infections, production of human proteins.
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Transgenic animalsGene causes these mice to glow in the dark. Normally, the gene is found in jellyfish.
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Transgenic plants: GM crops!
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Putting bacteria to work for us. Using recombinant DNA The human Insulin gene
is inserted into the bacterial DNA.
The bacteria now produces human insulin at a much faster pace and cheaper than animals can.
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Cloning
Natural clones – identical twins DNA must be identical to be a clone. Lifespan usually shortened. Health problems multiplied. Chance of survival before birth low. 1997 Dolly the sheep cloned, 1st
mammal
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A donor cell is taken from a sheep’s udder. Donor
Nucleus
These two cells are fused using an electric shock.
Fused Cell
The fused cell begins dividing normally.
Embryo
The embryo is placed in the uterus of a foster mother.Foster
Mother
The embryo develops normally into a lamb—Dolly
Cloned Lamb
Egg Cell
An egg cell is taken from an adult female sheep.
The nucleus of the egg cell is removed.
Section 13-4
Figure 13-13 Cloning of the First Mammal