Module 6 +depth study

When and how did the earliest form of biotechnology begin?

Around 8000 BC, when humans began using selective breeding and cross-breeding to produce plants and animals with more desirable traits

What historical event in the early 20th century accelerated the field of genetics/biotechnology?

The rediscovery of Mendel's work on genetics around the turn of the 20th century, which rapidly advanced the fields of genetics and biotechnology

What shift occurred in genetics/biotechnology research around 1950?

Research shifted from purely defining/understanding genetics towards more practical applications, following the first embryo transplants, pivoting towards cloning, fertilisation technologies, and continued mechanistic research

According to the 'History of the development of biotechnology' timeline (Ancient - Classical - Modern), what technologies mark the 'Ancient' era?

Domestication of plants and animals, and fermentation

What technologies mark the 'Classical' era of biotechnology on the timeline?

Genetics, vaccines and antibiotics

What technologies mark the 'Modern' era of biotechnology on the timeline (in order of the graph)?

DNA structure, monoclonal antibody, PCR, transgenics, cloning, and the Human Genome Project - after which further development is described as 'difficult to predict'

What organisation is researching bringing back traits of extinct animals (de-extinction), and what species are examples?

Colossal Biosciences, working on de-extinction traits for animals such as woolly mammoths and dire wolves - suggested as a likely future direction for biotechnology given its recent rise in popularity/attention

Give an example of current biotechnology in AGRICULTURE, its description and its use.

GMOs (Genetically Modified Organisms) - organisms containing DNA altered via laboratory genetic engineering techniques - used to increase disease resistance, increase yield, and add important nutrients to a population's diet

Give an example of current biotechnology in MEDICINE, its description and its use.

Gene therapy - the modification, replacement or repair of faulty genes within a patient's cells - used to treat or prevent illnesses

Give an example of current biotechnology in INDUSTRY, its description and its use.

Industrial enzyme production - culturing microbes to produce enzymes for commercial use; e.g. amylases break down starches into sugars, used in baking, brewing, and biofuel production

What is the Agrobacterium tumefaciens method of creating GM plants?

A bacterium naturally carrying the desired genes is grown together with plant cells/tissue pieces; the bacterium transfers the desired gene into the plant cells, which then develop into a GM plant

What is the particle gun (biolistic) method of creating GM plants?

Metal particles are coated with DNA encoding the desired genes, then these coated particles are physically fired ('bombarded') into plant tissue/cells, delivering the new DNA directly into the cells

What is Marker Assisted Selection (MAS)?

A breeding technique where specific crops are selected not directly based on the desired trait itself, but on morphological, biochemical or DNA/RNA variation 'markers' that are linked to (associated with) that trait of interest

What are the main social implications/safety concerns raised about genetically modified crops for human consumption?

Debate over safety includes concerns about antibiotic resistance, allergenicity, nutritional changes, and the formation of toxins in GM food products

What is a key ethical/equity concern specific to Marker Assisted Selection (MAS)?

While MAS is generally regarded as a safe procedure, there are concerns about its affordability and the importance of ensuring developing countries have access to technologies like MAS

Describe the general process of animal cloning (as summarised in this research task).

DNA is extracted from an animal's somatic cell; this genetic information is implanted into an (enucleated) embryo/egg, which is then implanted into a surrogate's reproductive tract

What are the main animal welfare concerns specific to cloning animals?

Pre-natal failures, surrogate mother suffering due to 'large-offspring syndrome', and poor post-natal health of clones such as deformities and deficiencies

What are the main social implication concerns for transgenic organisms (similar to GM crops)?

Concerns focused on human health after consumption, including potential antibiotic resistance, allergenicity, nutritional changes, and the formation of toxins

What is the distinction between 'intended' and 'unintended' effects in animal welfare concerns about biotechnology?

Intended effects are essentially unavoidable since the very purpose of the technology is to observe/induce a change in the animal; unintended effects arise from the inaccuracy of current technology and incomplete understanding of gene function

What does the ethical concern of 'environmental sustainability' in biotechnology involve?

Consideration of how biotechnology is used in environmental remediation, pollution prevention, and sustainable resource management, and whether such uses are morally justified

What does the ethical concern of 'ownership of genetic material' involve?

Issues around the use of stored DNA samples without consent, who owns genetic data once collected/stored, an individual's right to learn about their own heritable diseases, and the use of DNA in for-profit research ventures

What technical goals are researchers pursuing to improve future CRISPR-Cas9 applications?

Minimising toxicity, avoiding disruption to global DNA repair mechanisms, enabling more tunable/controllable editing outcomes, developing delivery systems with cell-type specificity, achieving temporal control (timing of gene expression/editing), and minimising unintended genetic perturbation

How could CRISPR address future global HEALTH challenges?

By developing transformative gene-based medicines that target specific disease-causing/influencing genes, and by engineering cell therapies that can address a wide range of diseases

How could CRISPR address future AGRICULTURE challenges?

By precisely altering plant DNA sequences to breed plants with specific desired traits, notably without requiring the introduction of foreign DNA into the genome (unlike traditional transgenic methods)

How could CRISPR address future ENVIRONMENTAL SUSTAINABILITY challenges?

By helping create sustainable, carbon-neutral methods of food and energy production, and manufacturing processes that reduce plastic waste, greenhouse gases, and food waste

What are the key RISKS associated with CRISPR-Cas9 technology?

Off-target genome editing effects (unintended edits elsewhere in the genome), on-target events causing unforeseen consequences, and the lack of any post-exposure treatment to reverse unwanted genetic material changes

What are the key ETHICAL CONCERNS associated with CRISPR-Cas9 technology (beyond safety)?

Safety/unintended outcomes; issues of access, justice and human rights (who gets access to the technology); questions of 'naturalness' and deviation from nature; and debates over humanity's right to make genetic decisions and adapt nature to our own interests

What are the key REGULATORY CHALLENGES associated with CRISPR-Cas9 technology?

Potential misuse could be disastrous for society/environment; the 'dual-use' nature of the technology (beneficial and harmful uses) makes it hard for law enforcement to control; while several countries have introduced regulatory laws, agencies intentionally differentiate between traditional GMOs and newer Gene Editing (GE) technologies like CRISPR in how they're regulated

How is gene therapy specifically described in terms of its mechanism?

A technique using genes to prevent or cure medical diseases/disorders, by adding new functional copies of a dysfunctional gene, or by replacing defective or missing genes entirely

How is recombinant DNA technology specifically described in terms of its mechanism?

The use of enzymes and laboratory techniques to isolate desirable genes; this can be used to combine DNA from different species, or to create genes with entirely new functions

What is genome sequencing?

The process of determining the precise order of the bases (nucleotides) in a DNA molecule

Outline the basic process of DNA sequencing (as illustrated in the NHGRI fact sheet).

DNA is extracted from a tissue sample (e.g. liver); a 'library' of hundreds of millions of genomic DNA fragments is prepared on a surface; a single genomic fragment is copied thousands of times; genomic samples are then run through a sequencing machine, followed by computational analysis of the resulting data

Outline the basic process of creating and duplicating recombinant DNA (as illustrated in the NHGRI diagram).

DNA of interest and a plasmid are both digested (cut) with the same restriction enzyme; DNA ligase joins the DNA of interest into the plasmid, forming recombinant DNA; this recombinant DNA is introduced into bacterial cells, which then copy the DNA as the cells divide

How does gene therapy work at the cellular level, based on the viral vector illustration?

A viral vector carrying a functional copy of a gene delivers that gene into a human cell; the functional gene enters the nucleus, providing a working copy alongside (or instead of) the patient's defective gene

What specific medical breakthroughs are attributed to genetic technologies?

Production of vaccines and medicines, development of diagnostic tests, treatment of genetic diseases, and development of targeted disease therapies - e.g. using gene editing to help eradicate malaria and to treat cystic fibrosis

What specific food production benefits are attributed to genetic technologies?

Improving crops via selective breeding and transgenic organisms to introduce or increase the prevalence of desirable traits - e.g. the introduction of beta-carotene into rice to create Golden Rice

What environmental management risks are attributed to genetic technologies?

GM crops well-suited to one environment can significantly affect biodiversity and the growth of native plants if introduced elsewhere; growth hormone genes introduced into farmed animals (e.g. fish, pigs) risk escaping into wild/general populations, e.g. growth hormone use in farmed salmon

What is the debate around 'where to draw the line' regarding genetic technologies and societal wellbeing?

Whether the line should be drawn between using genetic technology for medical treatment of disease versus using it for enhancement (e.g. of non-medical traits), and concerns that access to such technology could deepen the economic/genetic disparity between wealthy and underprivileged groups

How can genetic modification of crops negatively affect biodiversity?

It can negatively impact non-target organisms and abiotic factors like soil and water systems; it also tends to increase herbicide use, which drives the development of herbicide-resistant 'superweeds' and 'superpests'

How can cloning negatively affect biodiversity in a population?

Populations of cloned (genetically near-identical) animals can be affected by disease simultaneously, since they lack the genetic diversity that would otherwise offer some individuals natural resistance

How can selective breeding negatively affect biodiversity/genetic health?

It often results in a population with very similar genetics, meaning the population shares the same strengths but also the same weaknesses; it can also make genetic diseases more apparent due to inbreeding

What is 'genetic erosion'?

The process where widespread, high-yield genetically modified crop varieties replace native, naturally-adapted local varieties, reducing overall agricultural genetic diversity

How could cloning affect native gene pools of livestock/crops over the long term?

Widespread use of cloning could accelerate the dilution of native gene pools by imported/cloned breeds, resulting in an overall loss of genetic diversity

How can herbicide-resistant transgenic crops harm surrounding ecosystems long-term?

Gene flow from herbicide-resistant transgenic crops can transfer resistance genes to nearby weeds, creating new, harder-to-control weed variants that can harm both future crop production and the surrounding ecosystem

What positive conservation applications does gene editing offer for endangered species?

It can introduce higher genetic diversity into dwindling populations with limited gene pools, increase a species' ability to adapt to new/changing environments, assist management of invasive species, and help restore ecosystems damaged by human activity

What is 'gene drive' and how might it relate to conservation of biodiversity?

A genetic technology/technique (mentioned alongside assisted reproduction technology) that can be used to spread particular genes through a population rapidly - proposed as a way to increase genetic biodiversity and help lower populations of invasive species

What balanced conclusion can be drawn about whether genetic technologies are beneficial or harmful to biodiversity overall?

Genetic technologies are ultimately beneficial for biodiversity if properly regulated, but can be detrimental if not; keeping GMOs introduced to assist wild populations separate from those modified purely for human benefit is key to ensuring a net positive impact on biodiversity

What is the specific purpose of artificial insemination as a reproductive technology?

To allow favourable traits to spread more rapidly across progeny, and to support the reproductive success and conservation of endangered animal populations

What is the specific purpose of artificial pollination as a reproductive technology?

To produce crops while limiting the effects of bloom asynchrony and adverse weather events (securing crop yield), and to limit the prominence of self-pollination in certain species

What are the agricultural importance points of artificial insemination?

It boosts the productivity and population size of livestock, makes breeding programs more manageable and scientifically controlled, and improves the genetic diversity of livestock populations

What are the agricultural importance points of artificial pollination?

It enhances productivity and crop yields, introduces precise control into breeding programs (to develop high-yield, resilient varieties), and limits self-pollination, allowing increased genetic diversification of crops

What are the specific ethical concerns of artificial insemination?

Dangers of inbreeding and resulting medical needs of offspring, loss of genetic diversity in populations, transmission of diseases, and potential harm caused to either parent animal during the process

What are the specific ethical concerns of artificial pollination?

It is labour intensive, may decrease reliance on/demand for natural pollinators like bees (which are ecologically essential), and raises concerns about humanity's right to forcibly alter plant varieties in unnatural ways

How is gene cloning specifically defined in molecular biology terms?

A technique for molecular biology allowing the isolation, amplification and production of recombinant DNA

What are the six specific steps of gene cloning using plasmids and bacteria?

1) The desired gene is identified 2) FISH technology locates the desired gene within the organism's DNA 3) A restriction enzyme cuts out the desired DNA sequence and opens the plasmid DNA 4) The gene is inserted into the plasmid, with the restriction enzyme creating 'sticky ends' to bind the gene to the plasmid 5) Ligase repairs and consolidates the gene so it combines with the plasmid DNA 6) The recombinant plasmid is inserted into bacteria, which then undergo mitosis to duplicate the plasmid DNA containing the desired gene

What does the story of 'Dolly the Sheep' (1996) illustrate about SCNT?

Dolly was the first mammal cloned via Somatic Cell Nuclear Transfer: a nucleus was removed from a donor (Finn Dorset) somatic cell and fused with an enucleated egg cell from another ewe using electrical pulses, then the resulting embryo was implanted into a surrogate mother (Scottish Blackface ewe), producing a genetically identical lamb to the original nucleus donor

How effective is whole organism cloning, according to research evidence?

It is very inefficient - clones often cannot develop into healthy individuals, adverse health defects (e.g. in vital organs) have been observed, the process doesn't always work, can result in spontaneous abortion, and is very expensive, time-consuming, and requires many embryos

How effective is gene cloning, according to research evidence?

It generally has a high success rate - e.g. techniques like Golden Gate Assembly can achieve upwards of a 90% success rate - though there can be difficulty expressing eukaryotic genes in bacterial hosts, and some genes are too large to be contained within standard plasmids

What are real-world applications of whole organism cloning?

Producing essential proteins for humans (harvested from the milk of cloned animals), testing new drugs/treatment strategies, making copies of animals with desirable agricultural traits, and building up populations of endangered or extinct animals

What are real-world applications of gene cloning?

Development of vaccines and pharmaceuticals, creating synthetic human insulin and erythropoietin, converting waste into biofuel/bioethanol, and producing microbes used in biomining and bioremediation

What are the key ethical dilemmas associated with cloning technologies overall?

High failure rates, significant risk of genetic malformation in clones, likelihood of pregnancy losses and abnormal births, eugenic/enhancement concerns if human cloning were ever legalised, and philosophical questions about the identity and individuality of human clones

In source evaluation, what is the distinction between 'validity' and 'reliability' of a source?

Validity measures how accurately a source reports its claims - i.e. whether information is presented truthfully, precisely and appropriately for context. Reliability refers to the consistency, credibility and trustworthiness of a source - i.e. whether it can be depended upon to produce consistent findings

What are the five components of a CRAAP test for evaluating a source?

Currency (how recent/updated), Relevance (does it relate to the topic and suit the intended audience/level), Authority (who is the author/publisher and are they qualified), Accuracy (is it evidence-based, verifiable, and free from bias/errors), and Purpose (is it meant to inform, persuade, sell, entertain, and is it objective or biased)

Why might a .gov domain source be considered more valid/reliable than a .org advocacy group source?

A .gov domain typically indicates the source is produced/reviewed by credentialed government scientists with no commercial bias and is regularly updated with verified evidence, whereas an advocacy .org source may present information from a particular ideological or persuasive standpoint, without the same peer-review or institutional accountability

Why is cross-referencing multiple sources important in establishing reliability?

If independent sources (e.g. two different peer-reviewed articles or two government fact sheets) reach consistent conclusions on the same topic, this strengthens confidence in the reliability of the findings, since the information isn't dependent on a single potentially biased or flawed source