What are mutations?

What are mutations?

• A. Temporary changes in cell shape.
• B. Genetic changes in DNA.
• C. Proteins that alter replication.
• D. Environmental toxins that kill cells.

Answer: (B)

Mutations are permanent changes in the DNA sequence of an organism, a gene, or a chromosome. These alterations can arise spontaneously during DNA replication or be triggered by mutagens such as UV light, chemicals, or certain viruses. Since DNA provides the instructions for making and regulating proteins, a mutation can change the proteins produced or how they’re expressed, potentially altering traits. In microbes, such genetic variability drives evolution and can lead to antibiotic resistance, metabolic shifts, or new adaptations. Some mutations have no noticeable effect, others reduce fitness, and some offer a survival advantage in a given environment. This idea is about changes in the genetic material itself, not temporary changes in cell shape, proteins that modify replication, or toxins that kill cells.

Mutations are permanent changes in the DNA sequence of an organism, a gene, or a chromosome. These alterations can arise spontaneously during DNA replication or be triggered by mutagens such as UV light, chemicals, or certain viruses. Since DNA provides the instructions for making and regulating proteins, a mutation can change the proteins produced or how they’re expressed, potentially altering traits. In microbes, such genetic variability drives evolution and can lead to antibiotic resistance, metabolic shifts, or new adaptations. Some mutations have no noticeable effect, others reduce fitness, and some offer a survival advantage in a given environment. This idea is about changes in the genetic material itself, not temporary changes in cell shape, proteins that modify replication, or toxins that kill cells.