Short Answer 
The mutation process starts with introducing an antibiotic resistance gene into *Chlamy* cells via horizontal gene transfer, creating a diverse population of mutated and wild-type cells. After two weeks, the colonies will show a mix of these cell types, confirming that mutations occur randomly and not all cells will be mutated.
Step 1: Understand the Mutation Process
The process begins with the introduction of an antibiotic resistance gene into a population of *Chlamy* cells through a method called horizontal gene transfer. This allows for the mutation of some cells while others remain wild-type. The randomness of DNA insertion means that not every cell will acquire the mutation, leading to a diverse population with varying characteristics.
Step 2: Assess the Colony Composition
After two weeks, the resulting colonies will contain a mix of mutated and wild-type cells, which is best described by statement B: “Some of the colonies are mutated cells and other colonies are wild-type cells.” Specifically, this indicates that not all cells are mutated due to the random nature of the DNA integration process.
Step 3: Evaluate Other Statements
When analyzing the other statements, consider the following:
- Statement A is unlikely, as the position for DNA insertion is random.
- Statement C could be possible since different mutations may influence growth rates differently.
- Statement D is not necessarily true, unless there was a specific targeting of genes responsible for flagella development.