In human genome, 1.4 million locations in DNA are the single base differences, these are called

Options

A. Short tandem repeats
B. Varibale number tandem repeats
C. Single nucleotide polymorphs
D. All the three

Answer

To solve the question regarding the 1.4 million locations in the human genome that are single base differences, we will analyze the options provided and identify the correct term for these variations.

### Step-by-Step Solution:

1. **Understanding the Question**: The question states that there are 1.4 million locations in the human genome where there are single base differences. We need to identify what these differences are called.

2. **Analyzing the Options**:
- **Option 1: Short Tandem Repeats (STRs)**: These are sequences of DNA where a pattern of two or more nucleotides is repeated and the repetitions are directly adjacent to each other. STRs are not single base differences.
- **Option 2: Variable Number Tandem Repeats (VNTRs)**: These are similar to STRs but can consist of longer repeating units and the number of repeats can vary among individuals. Again, these are not specifically single base differences.
- **Option 3: Single Nucleotide Polymorphisms (SNPs)**: SNPs are variations at a single nucleotide position in the DNA sequence among individuals. This matches the description of the 1.4 million locations mentioned in the question.
- **Option 4: All of the three**: This option suggests that all the previous options are correct, which is not the case since only SNPs refer to single base differences.

3. **Identifying the Correct Answer**: Based on the analysis, the correct term for the 1.4 million single base differences in the human genome is **Single Nucleotide Polymorphisms (SNPs)**, which corresponds to **Option 3**.

### Final Answer:
The single base differences in the human genome, found at 1.4 million locations, are called **Single Nucleotide Polymorphisms (SNPs)**.

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