Name the scientist(s) responsible for each of the following discoveries:
The base-pair rule ______________

Explanation

**Step-by-Step Solution:**

1. **Understanding the Base Pair Rule**: The base pair rule refers to the specific pairing of nitrogenous bases in DNA. In double-stranded DNA, adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G).

2. **Identifying the Scientist**: The scientist who is credited with formulating the base pair rule is Erwin Chargaff. He discovered that in any given DNA sample, the amount of adenine is equal to the amount of thymine, and the amount of cytosine is equal to the amount of guanine.

3. **Chargaff's Rule**: This principle is often referred to as Chargaff's rule, which states that the bases pair in a 1:1 ratio. For example, if there are 100 adenine bases, there will also be 100 thymine bases.

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