In the experiment shown below, several replica plates containing the antibiotic
ID: 147616 • Letter: I
Question
In the experiment shown below, several replica plates containing the antibiotic were made from the "No anti biotic" plate. Replica Plate A shows the colonies that grew. Carefully draw the colonies that will grow on Replica Plates B, C and D. (All of the replica plates have antibiotic).
The experiment demonstrated that (pick one)
A. A new environment (antibiotic) creates beneficial mutations in all individuals
B. A new environment creates beneficial mutations in some individuals.
C. The beneficial mutations must have existed prior to environmental change.
D. None of the above.
No antibiotic Replica Plate A Replica Plate B Replica Plate C Replica Plate D
Explanation / Answer
The correct option is option C that is The beneficial mutations must have existed prior to the environmental change.
Explanation: In master plate which has no antibiotics grown many colonies, but when it replicates on others plate via the replica plate method so only 2 colonies (individuals) were grown. That indicates these two only has beneficial mutations when allowed growing in a new environment. only these two are growing. As mentions that all plates have antibiotics, it means the new antibiotics environment allows to grow only those who already have the beneficial mutation.