The AT/GC ratio in human beings is (where A = adenin , T=thymine, G=Guanine, C=Cytosine)

Options

A. 1
B. 1.52
C. 9.3
D. 2

Answer

To determine the AT/GC ratio in human beings, we can follow these steps:

### Step 1: Understand the Components
In DNA, there are four nitrogenous bases:
- Purines: Adenine (A) and Guanine (G)
- Pyrimidines: Cytosine (C) and Thymine (T)

### Step 2: Identify the Relationships
In double-stranded DNA, the amount of purines (A + G) is equal to the amount of pyrimidines (C + T). This is known as Chargaff's rule. Therefore, we can express this relationship mathematically:
\[ A + G = C + T \]

### Step 3: Calculate the AT/GC Ratio
The AT/GC ratio can be expressed as:
\[ \text{AT/GC} = \frac{A + T}{G + C} \]

### Step 4: Use Known Values
From studies, it is known that in human DNA:
- The ratio of A + T to G + C is approximately 1.52. This means that the amount of A and T combined is greater than the amount of G and C combined.

### Step 5: Conclusion
Thus, the AT/GC ratio in human beings is approximately 1.52.

### Final Answer
The AT/GC ratio in human beings is 1.52.

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