Genetic Technologies

Genetic Technologies

Middle School

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Learning Objectives

• Differentiate between artificial selection, genetic engineering, and cloning.

• Explain the applications of gene therapy and DNA sequencing.

• Analyze the ethical issues of technologies like GMOs and DNA privacy.

• Describe how technologies like DNA fingerprinting and CRISPR are used.

Key Vocabulary

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Artificial Selection

Humans breed organisms with desired traits to produce the next generation, a process called artificial selection.

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Genetic Engineering

This involves transferring a gene from one organism to another to produce desired traits in the receiving organism.

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Gene Therapy

This is a process that involves changing a gene to treat a medical disease or a specific disorder.

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Clone

An organism that possesses the exact same genes as the one from which it was originally produced.

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Genome

The complete set of genetic information that an organism carries in its DNA, defining its genetic makeup.

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DNA Fingerprint

A unique pattern made from DNA fragments that can be used to accurately identify an individual.

Key Vocabulary

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CRISPR

A modern gene-editing tool that has the capability to cut out a specific DNA sequence.

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Genetically Modified Org.

Genetically modified organisms are those whose DNA has been altered for a specific desired purpose.

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Selective Breeding

The process where humans choose to breed organisms that have certain desired traits or characteristics.

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DNA Sequencing

The process of determining the exact sequence of nitrogen bases in an organism's DNA strand.

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Influencing Inheritance: Artificial Selection

• Artificial selection, or selective breeding, is when humans choose which organisms reproduce.

• ​Unlike natural selection, the traits chosen by humans may not help survival.

• It is used in animal husbandry to breed larger livestock like cows.

• This process also created the many different breeds of purebred dogs.

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Multiple Choice

What is the definition of artificial selection?

• A process where humans choose which organisms reproduce based on desired traits.

• A process where organisms randomly develop new traits to survive.

• A process that only occurs in wild animal populations.

• A process that is guided by changes in the natural environment.

Multiple Choice

What is a key difference between artificial selection and natural selection?

• The traits selected by humans may not improve an organism's survival.

• It only works on animals, while natural selection only works on plants.

• It is a much slower process than natural selection.

• It creates organisms that are always larger and stronger.

Multiple Choice

Which of the following scenarios is the best example of a human goal achieved through artificial selection?

• To help wild dogs find food more easily in their natural habitat.

• To ensure all dogs have the best traits for surviving in the wild.

• To develop dog breeds with specific appearances, like poodles and bulldogs.

• To increase the genetic diversity of the overall dog population.

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Direct Gene Manipulation: Genetic Engineering

Glowing Fish

• Scientists transfer a gene for fluorescence from a jellyfish into a fish egg.

• This process results in a fish that can glow brightly under a special light.

• This technique could be used to help track different chemicals within the body.

Insulin Production

• The gene for making human insulin is inserted into the DNA of bacteria.

• These genetically engineered bacteria then produce large amounts of pure human insulin.

• This provides a vital supply of insulin for people who have diabetes.

Multiple Choice

What is the primary purpose of genetic engineering?

• To directly modify an organism's genes to produce a desired trait.

• To study how different species interact in an ecosystem.

• To create new species of animals from scratch.

• To help organisms glow in the dark naturally.

Multiple Choice

How are the processes for creating glowing fish and producing insulin similar?

• They both use genes that come from bacteria.

• They both involve transferring a gene from one organism into another.

• They both result in a product that helps people with diabetes.

• They both are used to track chemicals inside the body.

Multiple Choice

What conclusion is best supported by the two examples of genetic engineering?

• It is most useful for making animals change color.

• It can only be used to create medicines for human diseases.

• It can be used to develop solutions for problems in both medicine and research.

• It is a process that only works on bacteria and fish.

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Correcting Genetic Issues: Gene Therapy & CRISPR

Genetic Disorders

• Gene therapy is a method that aims to treat medical diseases by correcting genetic problems.

• Sickle cell disease is a disorder caused by a DNA mutation affecting hemoglobin in red blood cells.

• The cells become crescent-shaped, cannot carry oxygen effectively, and cause significant pain and health issues.

CRISPR Technology

• CRISPR is a promising gene-editing tool that can precisely correct mutations in the DNA sequence.

• It uses a special guide RNA to find the specific part of the DNA with the mutation.

• An enzyme then cuts out the faulty DNA, and a corrected copy of the sequence is pasted in.

Multiple Choice

What is the primary purpose of gene therapy?

• To treat medical diseases by correcting genetic problems.

• To identify and classify new types of genetic mutations.

• To create entirely new organisms in a laboratory.

• To study the physical shape of red blood cells.

Multiple Choice

What is the specific role of the guide RNA within the CRISPR system?

• It guides an enzyme to the specific part of the DNA with the mutation.

• It cuts the faulty DNA sequence out of the cell.

• It provides the corrected copy of the DNA to be pasted in.

• It changes the shape of the red blood cells directly.

Multiple Choice

Based on the information provided, how would CRISPR technology be applied to treat an individual with sickle cell disease?

• It would need to fix the DNA mutation related to hemoglobin.

• It would have to increase the amount of oxygen in the blood.

• It would need to physically change the shape of the crescent cells.

• It would have to eliminate the enzyme that cuts the DNA.

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What Is Cloning?

• A clone is an organism with the exact same genes as its parent.

• This process is a form of asexual reproduction, creating a genetic copy.

• Animals are cloned using a body cell’s nucleus and an unfertilized egg.

• Cloned crops like bananas have low genetic diversity, risking widespread disease.

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Multiple Choice

What is the defining characteristic of a clone?

• It has the exact same genes as its parent.

• It has a mix of genes from two different parents.

• It is a close relative but not genetically identical.

• It is created through sexual reproduction.

Multiple Choice

How does the process of cloning relate to asexual reproduction?

• It uses the genetic material from a single parent organism.

• It requires the fertilization of an egg cell by a sperm cell.

• It results in an organism with a new combination of genes.

• It can only be performed on simple organisms like bacteria.

Multiple Choice

A farmer decides to plant an entire crop of bananas by cloning them from a single, high-yielding plant. What is the most significant risk the farmer faces?

• A single disease could wipe out the entire crop because the plants are genetically identical.

• The crop would be stronger because all the plants have the same beneficial genes.

• Some of the plants would naturally resist the disease due to genetic variations.

• The low genetic diversity would cause the bananas to taste different.

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Reading the Code: DNA Sequencing & Technologies

• DNA Sequencing – Finds the exact order of the four DNA bases (A, C, G, T).

• Human Genome Project – Mapped all human genes to understand their functions.

• DNA Screening – Checks for gene mutations linked to disorders.

• DNA Fingerprinting – Creates a unique DNA pattern used in crime-solving.

• These technologies all analyze DNA, but each has a different application—from studying genes to solving crimes.

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Multiple Choice

What is the main purpose of DNA sequencing?

• To find the exact order of the four bases in a strand of DNA.

• To create a unique pattern used to solve crimes.

• To map all the genes found within the human body.

• To check for mutated genes linked to genetic disorders.

Multiple Choice

What is the relationship between using DNA screening to find mutated genes and using a DNA fingerprint to solve a crime?

• They both are primarily used to solve criminal cases.

• They both focus on mapping the entire set of human genes.

• They both use the order of DNA bases to find specific information.

• They both can only be used to identify genetic disorders.

Multiple Choice

What is the most important conclusion that can be drawn from the different uses of DNA technology presented?

• The Human Genome Project is the most important tool for solving crimes.

• DNA screening is only useful for mapping genes, not for identifying disorders.

• Understanding an organism's DNA sequence can be applied to solve problems in different fields like medicine and forensics.

• A DNA fingerprint is too complex to be used for identifying specific genetic mutations.

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The Debate: Controversies of DNA Use

Genetic Privacy

• Concerns have been raised about who can access and use your private genetic information.

• The Genetic Information Nondiscrimination Act (GINA) was passed in 2008 to address these concerns.

• This law makes it illegal for employers or health insurers to discriminate based on genetic data.

GMO Controversy

• Supporters of Genetically Modified Organisms (GMOs) say they help farmers produce more pest-resistant crops.

• However, opponents worry about the unknown long-term effects of GMOs on our health and environment.

• A major concern is that genetically modified plants could accidentally mix with wild plant populations.

Multiple Choice

What is the primary purpose of the Genetic Information Nondiscrimination Act (GINA)?

• To fund research into new types of genetically modified organisms.

• To prevent discrimination by employers or health insurers based on genetic data.

• To regulate the sale of pest-resistant crops to farmers.

• To require all citizens to share their genetic information for research.

Multiple Choice

Which statement best summarizes the main conflict in the GMO controversy?

• They are supported by farmers but opposed by health insurers.

• They can produce pest-resistant crops, but their long-term effects are unknown.

• They are a solution to genetic privacy concerns.

• They are known to be safe for the environment but not for human health.

Multiple Choice

If genetically modified, pest-resistant crops were found to be cross-pollinating with a nearby wild plant population, what is a logical long-term environmental concern?

• The wild plants would be protected by the GINA law.

• The genetically modified crops would likely die out.

• The wild plants could gain pest-resistance, potentially creating invasive 'superweeds'.

• Farmers would be able to produce more crops in that area.

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Common Misconceptions

Misconception	Correction
Artificially selected traits are always better for the animal.	These traits can sometimes lead to health problems in the animal.
'Genetically Modified' only refers to plants and crops.	Genetic modification also applies to bacteria, animals, and even human cells.
A clone is an instant, fully-grown copy of the original.	Cloning creates a genetic copy that must grow from an embryo.
Anyone can use your genetic information against you.	Laws like GINA protect against genetic discrimination by employers or insurers.

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Summary

• Selective breeding and cloning create desired traits but risk lowering genetic diversity.

• Genetic engineering moves genes across species; bacteria manufacture human insulin.

• Gene therapy and CRISPR edit faulty genes to treat inherited disorders.

• DNA sequencing and fingerprinting reveal personal data, raising privacy and GMO ethics debates.

Poll

On a scale of 1-4, how confident are you about the concepts covered in today's review?

• 1

• 2

• 3

• 4