Describe applications of biotechnology, including genetic engineering, GMOs, selective breeding, and DNA fingerprinting, and consider their benefits and concerns (Ohio's Learning Standards for Science, Biology, B.H.5).

What this topic is asking

Ohio standard B.H.5 (the structure of DNA determines the structure of proteins) leads into the applications that use our knowledge of DNA and proteins. Ohio's Biology EOC turns this into items on biotechnology: genetic engineering and GMOs, selective breeding, and DNA fingerprinting, along with the benefits and concerns each raises. The crosscutting idea is cause and effect, applied to technology: knowing how genes code for proteins lets humans change organisms on purpose and identify individuals from their DNA.

Genetic engineering and GMOs

Genetic engineering works because the genetic code is shared across life: a gene that codes for a protein in one organism will code for the same protein in another. The standard EOC example is insulin production: the human gene for insulin is inserted into bacteria, which then make human insulin that can be purified and used to treat diabetes. Other examples include crops engineered for pest resistance or improved nutrition (such as crops with added vitamins).

Selective breeding

Selective breeding is the much older way humans have shaped organisms, and the EOC distinguishes it from genetic engineering.

• In selective breeding, humans choose which individuals reproduce, so that desirable traits (high milk yield, large fruit, a calm temperament) are passed to the next generation.
• It can only work with variation that already exists in the population, and it takes many generations.
• It does not move genes directly between organisms; it just controls who mates with whom.

Selective breeding produced most crop plants, farm animals, and dog breeds long before DNA was understood. The contrast for the EOC: genetic engineering transfers a gene directly, while selective breeding chooses breeders over generations.

DNA fingerprinting

DNA fingerprinting uses the fact that each person's DNA has a unique pattern of repeated sequences. By analyzing these regions, scientists produce a banding pattern, a "fingerprint," that is unique to an individual (except for identical twins, who share the same DNA). Uses include:

• Forensics: matching DNA from a crime scene to a suspect.
• Paternity and relationship testing: confirming biological family relationships.
• Identifying remains and studying genetic diversity in conservation.

Benefits and concerns

The EOC expects you to weigh both sides, in line with the standards' emphasis on using science responsibly.

• Benefits: medicines (insulin, vaccines), higher crop yields and better nutrition, disease-resistant crops, and powerful tools for justice and identification.
• Concerns: ethical questions about modifying organisms, possible effects of GMOs on ecosystems and human health, loss of genetic diversity from heavy selective breeding, and privacy issues around personal DNA data.

A good EOC answer names a specific benefit and a specific concern rather than a vague "good and bad."

Try this

Q1. State the difference between genetic engineering and selective breeding. [2]

• Cue. Genetic engineering transfers a gene directly from one organism into another (making a GMO); selective breeding chooses which organisms reproduce to pass on traits over generations.

Q2. Explain how DNA fingerprinting can identify an individual. [2]

• Cue. Each person's DNA has a unique pattern of repeated sequences, so the banding pattern (fingerprint) is unique to an individual (except identical twins), allowing a sample to be matched to a person.