- Draw the base anchor by just clicking once with the Pen Tool.
- Draw the top anchor by click-dragging with the pen tool
- Click the base anchor again.
If you then want to curve the bottom anchor a bit, with the Pen Tool still active, hold down the Option/Alt key and click-drag on top of the bottom anchor to pull out handles, and add a smooth curve to it.
//Option #B
- Draw an ellipse
- Select the bottom anchor
- Double-click the Scale Tool in the Toolbar and enter a reduction percentage
- Select the 2 middle anchors and move them upwards until you get the shape you want.
//Option 3
- Draw a Circle
- Using the Direct Selection Tool (white arrow) click and drag the bottom anchor downward