The number of dipeptides that can be made from alanine and glycine are .

Explanation

To determine the number of dipeptides that can be formed from the amino acids alanine and glycine, we can follow these steps:

### Step 1: Understanding Dipeptides
Dipeptides are molecules formed by the combination of two amino acids. Each dipeptide consists of two amino acid residues linked by a peptide bond.

### Step 2: Identifying the Amino Acids
In this case, the two amino acids we are working with are:
- Alanine (A)
- Glycine (G)

### Step 3: Combinations of Amino Acids
When forming dipeptides, we can combine the amino acids in two different ways:
1. Alanine can be the first amino acid, followed by Glycine.
2. Glycine can be the first amino acid, followed by Alanine.

### Step 4: Listing the Dipeptides
From the combinations, we can list the possible dipeptides:
1. Alanine + Glycine → **Alanine-Glycine (A-G)**
2. Glycine + Alanine → **Glycine-Alanine (G-A)**

### Step 5: Considering Different Forms
In addition to the order of the amino acids, we can also consider the different forms (alpha and beta) of alanine:
1. Alpha-Alanine + Glycine → **Alpha-Alanine-Glycine**
2. Beta-Alanine + Glycine → **Beta-Alanine-Glycine**
3. Glycine + Alpha-Alanine → **Glycine-Alpha-Alanine**
4. Glycine + Beta-Alanine → **Glycine-Beta-Alanine**

### Step 6: Total Count of Dipeptides
Thus, the total number of dipeptides that can be formed from alanine and glycine is **4**:
1. Alpha-Alanine-Glycine
2. Beta-Alanine-Glycine
3. Glycine-Alpha-Alanine
4. Glycine-Beta-Alanine

### Final Answer
The number of dipeptides that can be made from alanine and glycine is **4**.

---