How do biotechnologies alter organisms, and what are their benefits and concerns?
Describe biotechnologies (selective breeding, genetic engineering, GMOs, cloning, gene therapy, and DNA fingerprinting) and discuss their implications and applications for the individual and society (Virginia 2018 Biology SOL BIO.5.d).
A SOL-level answer on biotechnology for the Virginia Biology EOC: selective breeding, genetic engineering and GMOs, cloning, gene therapy, and DNA fingerprinting, with their benefits, risks, and ethical implications.
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What this topic is asking
Virginia Biology SOL standard BIO.5.d states that biotechnology has implications for the individual and society. The Biology EOC expects you to know the main biotechnologies, selective breeding, genetic engineering and GMOs, cloning, gene therapy, and DNA fingerprinting, and to discuss their benefits, risks, and ethical questions. This is the applied end of genetics, where the molecular biology you have learned is put to use.
Selective breeding versus genetic engineering
Selective breeding is ancient (it produced our crops, livestock, and dog breeds) but slow and limited to existing variation. Genetic engineering is fast and can introduce entirely new traits, even from other species, because the genetic code is universal, the same codons code for the same amino acids in all organisms.
Genetic engineering and GMOs
A genetically modified organism (GMO) has had its DNA deliberately altered by genetic engineering. A landmark example is inserting the human insulin gene into bacteria: the bacteria read the gene with their own machinery and produce human insulin, which can be harvested in large amounts to treat diabetes. Other examples include crops engineered for pest resistance or improved nutrition. GMOs bring clear benefits (reliable medicines, higher and more resilient yields) but also raise concerns about effects on ecosystems, the spread of modified genes, and long-term safety.
Cloning, gene therapy, and DNA fingerprinting
- Cloning produces a genetically identical copy of an organism. It can propagate plants or, more controversially, animals, and it raises ethical questions.
- Gene therapy aims to treat genetic disease by replacing or correcting a faulty gene in a patient's cells. It offers hope for inherited disorders but is technically difficult and raises safety and ethical issues.
- DNA fingerprinting uses each person's unique DNA pattern to identify individuals. It is used in forensic science (matching a suspect to a crime scene), paternity testing, and identifying remains, and it raises questions about privacy and the use of genetic data.
Implications for the individual and society
The standard emphasizes weighing benefits against risks and ethics. Biotechnology can cure disease, feed more people, and deliver justice, but it also raises hard questions: Is it safe to release GMOs into the environment? Who owns and controls genetic information? Is it fair to edit human genes? The EOC may ask you to discuss both sides, so be ready to give a benefit and a concern for a given technology rather than only praising or condemning it.
Try this
Q1. Explain the difference between selective breeding and genetic engineering. [2]
- Cue. Selective breeding chooses organisms with desired traits to breed over many generations (using existing variation); genetic engineering directly inserts or alters specific genes, often between organisms.
Q2. State one use of DNA fingerprinting and one concern it raises. [2]
- Cue. Use: forensic identification, paternity testing, or identifying remains. Concern: privacy and the control or misuse of personal genetic data.
Exam-style practice questions
Practice questions written in the style of VDOE exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
VA Biology SOL (2023 released style)1 marksWhich best describes genetic engineering? (A) choosing organisms with desired traits to breed over many generations. (B) directly inserting or altering specific genes in an organism. (C) growing crops without fertilizer. (D) studying fossils.Show worked answer →
A 1-point multiple-choice item distinguishing genetic engineering from selective breeding.
The correct answer is B. Genetic engineering directly inserts or alters specific genes, often moving a gene from one organism into another. A describes selective breeding (using existing variation over generations), while C and D are unrelated.
The test rewards the distinction: genetic engineering edits genes directly; selective breeding chooses which organisms reproduce.
VA Biology SOL (2024 released style)2 marksBacteria can be genetically engineered to produce human insulin. (a) Explain how inserting the human insulin gene makes the bacteria produce insulin. (b) State one benefit of producing insulin this way.Show worked answer →
A 2-point item on a real application of genetic engineering.
(a) 1 point: the human insulin gene is inserted into the bacterium's DNA; because the genetic code is universal, the bacterium reads the gene and uses transcription and translation to make the human insulin protein, and the bacteria reproduce rapidly to make large amounts.
(b) 1 point: a benefit such as producing a reliable, large supply of human insulin that does not depend on extracting it from animals, is less likely to cause allergic reactions, and is cheaper at scale.
Markers reward explaining that the inserted gene is expressed by the bacterium's own machinery and one genuine benefit.
Related dot points
- Describe patterns of inheritance beyond simple dominance (incomplete dominance, codominance, multiple alleles, and sex-linked traits) and interpret pedigrees (Virginia 2018 Biology SOL BIO.5.b).
A SOL-level answer on inheritance patterns for the Virginia Biology EOC: incomplete dominance, codominance, multiple alleles such as ABO blood type, sex-linked traits, and reading pedigrees.
- Explain that a mutation is a change in the DNA base sequence with harmful, beneficial, or neutral effects, and that genetic variation (from mutation and sexual reproduction) is important to the survival of a species (Virginia 2018 Biology SOL BIO.5.c).
A SOL-level answer on mutations for the Virginia Biology EOC: what a mutation is, its harmful, beneficial, or neutral effects, the difference between body-cell and gamete mutations, and why genetic variation matters for survival.
- Describe the structure of DNA (the antiparallel double helix and base pairing) and explain how complementary base pairing allows DNA to be replicated accurately (Virginia 2018 Biology SOL BIO.5.a).
A SOL-level answer on DNA for the Virginia Biology EOC: the double helix, base pairing, why DNA is a stable information store, and how complementary base pairing allows accurate replication.
- Explain protein synthesis: how transcription copies DNA into mRNA and translation reads codons at the ribosome to build a protein, linking the DNA base sequence to the trait (Virginia 2018 Biology SOL BIO.5.a, supporting BIO.2.d).
A SOL-level answer on protein synthesis for the Virginia Biology EOC: transcription of DNA into mRNA, translation of codons at the ribosome, and how the DNA base sequence determines the protein and the trait.
- Explain how the role of variation and mutations drives natural selection, producing adaptation and changing the heritable traits of a population over generations (Virginia 2018 Biology SOL BIO.7.b).
A SOL-level answer on natural selection for the Virginia Biology EOC: variation and mutations as the raw material, overproduction and competition, differential survival and reproduction (fitness), and how selection produces adaptation and shifts allele frequencies, with antibiotic resistance as the worked example.
Sources & how we know this
- 2018 Science Standards of Learning (Biology) — Virginia Department of Education (2018)
- SOL Practice Items (All Subjects) — Virginia Department of Education (2024)