1. Determine the theme: First, you need to determine the theme of the mind map. This can be a specific biological concept, such as cell division, or a broader theme, such as a branch of biology.

2. Collect information: Once you decide on the topic, you need to collect relevant information and data. This may include books, articles, websites and other resources.

3. Create a master node: Start creating a master node on paper or using mindmanager. These nodes should represent your theme or sub-theme. For example, if your topic is "cell division", then your possible main nodes include "cell cycle", "mitosis" and "meiosis".

4. Add detailed information: under each major node, add more specific information or detailed information. For example, under the cell cycle, you might list G 1, S, G2 and M phases.

5. Connecting information: Use lines, arrows or other symbols to connect related information. This will help you understand and remember information better.

6. Review and revise: Finally, review your mind map to ensure that all information is accurate and relevant. If necessary, make modifications and adjustments.

7. Keep up with the times: Biology is a constantly developing field, and new research and discoveries will appear constantly. Therefore, it is very important to update your mind map regularly.

These are the basic steps to make a biological mind map. Remember, the most important thing is to keep clear, so that you can learn and understand the knowledge of biology effectively.