Question

Some bacteria are able to grow in Streptomycin containing medium due to -

• A. Natural selection
• B. Induced mutation
• C. Reproductive isolation
• D. Genetic drift

Answer 1

The correct option is A Natural selection

Bacteria are able to grow in a Streptomycin containing bacteria due to development of resistance to the bacteria by a process called natural selection. During this process random mutation occurs in the bacteria and it evolves to develop resistance to the antibiotic. Due to this it can continue to grow in the medium. Induced mutation occurs to a stress situation such as nutrient limitation. Reproductive isolation is the process in which a population is divided into two and reproductively isolated from one another. Genetic drift occurs for the fixation of deleterious mutations and results in genetically diverse population. So, the correct answer is ' natural selection'.