Mesh not receiving shadows?

Hi,

I am new to Unity (this is my first project!), and I am running into some difficulties with a mesh not receiving shadows.

I am making a mesh for the graph of a function, and it seems to be working well, but my graph is very difficult to see (it is all the same color):

I am thinking this is because it is not receiving shadows from itself. I noticed that it is in fact not receiving shadows from anything. I am not sure why, because I have set it to receive shadows: Here is the code I used to generate the mesh:

 void Start () {
         verts = new Vector3[resolution * resolution];
         tris = new int[12 * resolution * resolution];
         Vector2[] uv = new Vector2[resolution * resolution];
 
 
         float step = 10f / (resolution-1);
         for (int i = 0; i < resolution; i++)
         {
             for (int j = 0; j < resolution; j++)
             {
                 verts[resolution * i + j] = new Vector3(step * i - 5f, Mathf.Sin(100 * i), step * j - 5f);
                 if (i != resolution-1){
                     if (j != resolution - 1)
                     {
                         //print(resolution * (i + 1) + j + 1);
                         tris[12 * (resolution * i + j)] = resolution * i + j;
                         tris[12 * (resolution * i + j) + 1] = resolution * i + j + 1;
                         tris[12 * (resolution * i + j) + 2] = resolution * (i + 1) + j;
                         tris[12 * (resolution * i + j) + 3] = resolution * (i + 1) + j;
                         tris[12 * (resolution * i + j) + 4] = resolution * i + j + 1;
                         tris[12 * (resolution * i + j) + 5] = resolution * (i + 1) + j + 1;
                         tris[12 * (resolution * i + j) + 6] = resolution * i + j;
                         tris[12 * (resolution * i + j) + 7] = resolution * (i + 1) + j;
                         tris[12 * (resolution * i + j) + 8] = resolution * i + j+1;
                         tris[12 * (resolution * i + j) + 9] = resolution * (i + 1) + j;
                         tris[12 * (resolution * i + j) + 10] = resolution * (i + 1) +j + 1;
                         tris[12 * (resolution * i + j) + 11] = resolution * i + j + 1;
                     }
                 }
                 uv[resolution * i + j] = new Vector2((float)i / resolution, (float)j / resolution);
             }
         }
 
         mesh = new Mesh();
 
         mesh.vertices = verts;
         mesh.uv = uv;
         mesh.triangles = tris;
 
         GameObject game = new GameObject("Mesh");
         MeshFilter meshFilter = game.AddComponent<MeshFilter>();
 
         meshFilter.mesh = mesh;
 
         MeshRenderer meshRenderer = game.AddComponent<MeshRenderer>();
         meshRenderer.material = AssetDatabase.GetBuiltinExtraResource<Material>("Default-Material.mat");
     }

Is there some way to get the mesh to receive shadows? Any help would be greatly appreciated!