The study of mutations is easy in haploids as compared to diploids , because

Options

A. Haploids are more abundant in nature than diploids
B. All mutations, whether dominant or recessive are expressed in haploids
C. They are reproductively more stable than diploids
D. Mutagens penetrate in haploids more effectively than in diploids

Answer

To solve the question regarding why the study of mutations is easier in haploids compared to diploids, we can break it down step by step:

### Step 1: Understand the Definitions
- **Haploids**: Organisms or cells that contain a single set of chromosomes (n).
- **Diploids**: Organisms or cells that contain two sets of chromosomes (2n).

### Step 2: Analyze the Expression of Mutations
- In haploids, any mutation that occurs is expressed directly because there is only one allele for each gene. This means that both dominant and recessive mutations will show their effects without any masking.
- In contrast, diploids have two alleles for each gene. If a recessive mutation occurs, it may be masked by a dominant allele, making it harder to study.

### Step 3: Evaluate the Options
1. **Haploids are more abundant in nature than diploids**: This statement is incorrect. While haploids can be found in certain organisms, diploids are more common in many multicellular organisms.

2. **All mutations, whether dominant or recessive, are expressed in haploids**: This is the correct reason. Since haploids have only one allele for each gene, every mutation is directly observable.

3. **They are reproductively more stable than diploids**: This statement is misleading. Stability in reproduction does not directly relate to the ease of studying mutations.

4. **Mutagens penetrate in haploids more effectively than diploids**: This statement lacks evidence and is not a primary reason for the ease of studying mutations.

### Conclusion
The correct answer is that all mutations, whether dominant or recessive, are expressed in haploids, making the study of mutations easier in haploids compared to diploids.