- Do a proper scientific drawing of some onion cells under the microscope.
- Find the length and width of your onion cell for both your photo and your scientific drawing.
- By how many percent was your drawing length too big or too small compared to the photo? (you’ll have to figure out how to find this percent error!)
- Although onion cells only have 8 chromosomes, they have more DNA than we do!
Find all the errors in my drawing above. 🤔
The point of scientific drawing is generating a 2D model of what you are observing under the microscope. It is a visual observation of your data. Therefore drawing from memory is not as accurate nor precise as drawing bit by bit from the image under the scope or from a photo you took looking through the ocular lens. You are to draw what you actually see, not what you think you remember.
- Draw the circle which represents the field of view in the upper left part of your page. Your page must be an unlined sheet of paper.
- Only use pencil for everything.
- Label only structures you can confidently identify.
- Put the title of the specimen centered and underlined above the FOV circle.
- Put the magnification in brackets in the bottom-right just outside of the field of view.
- Labels must be vertically aligned to the right of the drawing.
- Label lines are to be totally horizontal but in some cases a vertical drop-down or extend-up line may be used. These are to be avoided where possible.
- Borders between structures are the most important and are to be drawn with clean, solid lines.
- Stippling is to be used when shading in areas that are darker (just tap it in!). No shading or cross-hatching is allowed.
Complete the Lewis dot periodic table for the the first twenty elements that we worked on in class. If you’re done it, then you have no homework! 🙂
Remember to bring in the Nomenclature Note in tomorrow. We have a lot of ground to cover this week.