Problem 13 - Biology Concepts and Applications

Question

________ can correct a genetic defect in an individual. a. Cloning vectors c. Eugenics b. Gene therapy \(\mathrm{d} \cdot \mathrm{a}\) and \(\mathrm{b}\)

Step-by-Step Solution

Answer

Gene therapy (option b) can correct genetic defects in an individual.

Step 1: Understanding the Question

The question is asking for an approach or method that can correct a genetic defect in an individual. The options given are 'cloning vectors', 'eugenics', 'gene therapy', and 'both d and b'. Here, we need to identify which among these technologies or concepts is specifically used to correct genetic defects.

Step 2: Analyzing Each Option

Let's analyze each option: 1. **Cloning Vectors**: These are tools used to clone or replicate DNA fragments in a host cell but they do not correct genetic defects. 2. **Eugenics**: This is a social philosophy or science aimed at improving genetic quality of human populations but is not involved in correcting genetic defects on an individual level. 3. **Gene Therapy**: This involves altering the genes of an individual to treat or prevent diseases by correcting defective genes. 4. **d.**: There is no information given, so this is likely a clerical error, and hence we only consider option 'b'.

Step 3: Selecting the Correct Option

Based on the analysis of each option, 'Gene therapy' (option b) is the correct answer as it is a method specifically aimed at correcting genetic defects in individuals by modifying their DNA.

Key Concepts

Genetic Defects

Genetic defects are anomalies in an individual's DNA sequence. These defects can lead to various inherited diseases and health conditions. They occur when there is a mutation or alteration in the genes which can disrupt normal bodily functions. Genetic defects can be:

• Hereditary: Passed down from parents to offspring, such as in cystic fibrosis or hemophilia.
• De Novo: New mutations that occur spontaneously, which were not present in the parents, like some cases of autism.

The implications of genetic defects vary greatly. They might cause minor issues or lead to severe health conditions which can drastically impact an individual's life. Scientists study these defects to better understand diseases and develop effective treatments. In recent years, gene therapy has emerged as a promising treatment method aimed at correcting these genetic anomalies directly in the DNA.

Cloning Vectors

Cloning vectors are crucial tools in biotechnology used to replicate and manipulate DNA. They are DNA molecules that carry foreign DNA into a host cell, where it can be replicated and sometimes expressed. Common types of cloning vectors include:

• Plasmids: Circular DNA found in bacteria, widely used due to their ability to replicate independently of the bacterial chromosome.
• Viral Vectors: Modified viruses used to deliver genetic material into cells, capitalizing on the virus's natural ability to infect cells.

Cloning vectors are instrumental in genetic engineering and research but are not designed to address genetic defects in humans directly. Instead, they serve as a tool for studying genes and developing products, such as insulin or growth hormones, and for other molecular biology applications.

Eugenics

Eugenics is a controversial field that deals with the improvement of the genetic quality of human populations. It historically aimed to encourage reproduction among people with desired traits and discourage or prevent reproduction among those with less desirable attributes. The concept includes:

• Positive Eugenics: Encouraging reproduction among individuals with desired genetic traits.
• Negative Eugenics: Reducing breeding among individuals with perceived genetic defects or undesirable characteristics.

While eugenics was once popular in the early 20th century, particularly in Western countries, it has since faced significant ethical criticism. This is due to its associations with forced sterilizations, discrimination, and human rights abuses. It does not address genetic defects at an individual level, unlike gene therapy, which directly seeks to correct specific genetic issues without making broad social judgments about human worth or potential.