Question
Biology Question on evolution
Some bacteria able to grow in Streptomycin containing medium due to
Natural selection
Induced mutation
Reproductive isolation
Genetic drift
Natural selection
Solution
The correct option is (A) : Natural selection
Because bacteria can evolve resistance to streptomycin through a process known as natural selection, bacteria can proliferate in a solution containing streptomycin. Random mutations take place in the bacterium throughout this process, which leads to the development of antibiotic resistance. This allows it to keep growing in the medium. When under stress, such as when there is a nutritional shortage, induced mutation takes place. A population is split in half and reproductively separated from the other half through the process of reproductive isolation. Genetic diversity in a population is the product of genetic drift, which fixes harmful mutations. So, "natural selection" is the right response.