DrosophiLab is a brilliant, free and downloadable piece of software that allows students and teachers to edit fruit flies and carry out crosses. The teacher can use the chromosome editor to set up parent flies of any genotype and there are 20 genes and traits represented, on four chromosomes. This allows for simple monohybrid crosses, sex-linkage, gene linkage and many other combinations – so the problems you set can be differentiated by level. There is also a password-protected teacher setting, to restrict students’ access to results tables and chromosome maps (so they have to work it out for themselves!).
Here are our class resources:
Fly files in this folder: http://www.box.net/shared/dy326rb01d
Chi-Calc (Chi-squared calculator, .xlsx)
How to catch and observe Drosophila:
And this is how you tell the sexes apart:
When trying to observe the flies for real, think about the following questions:
– How are you ensuring ethical treatment of the animals?
– How long would it take to determine the phenotypes of the number of flies you have set for your investigations?
– What difficulties do you encounter when observing the flies?
– What are the limitations or sources of error that might affect the reliability of your results?
Why are fruit flies so important in science?
Science loves fruit flies, and there was even a fruit fly Nobel awarded in 1995 for studies in embryonic development. This links neatly to the assessment statements regarding the differentiation of cells through expression of different genes.
Fruit fly cells are relatively easily observed, and Drosophila makes for an ideal model organism for Mendelian genetics as it has a short life cycle, reproduces quickly and is easily phenotyped.
Drosophila buscki from Journal of Endocrinology
Fruit fly graphic and DrosophiLab banner from DrosophiLab
This is a deceptively expansive subtopic, covering food energy, effects of high-energy diets, cultural diets, obesity and anorexia. The presentation has much more information than you need, but the links to health issues are there and worth paying attention to.
Class presentation with loads of video and animation links (click on the shadowed images):
You can watch the whole of Super Size Me online at GoogleVideo, and use this question sheet as you watch. You will need to do some further research. BIS Students, don’t waste the bandwidth – watch it on the network.
This is a moving clip from the StemCellFoundation, and their channel has lots of decent, informative video clips. Check it out.
Here’s a presentation to help you with your revision and to become familiar with the command terms – the ‘instruction words‘ that will be used in all exam question and that are used in the assessment statements in the subject guide.
If you go over to SlideShare to view the presentation, you should be able to download it as an editable powerpoint.
Here it is, tidied up for the revision unit:
Head on over to the class page here: Photosynthesis (Core and AHL)
Almost there Grade 12!
Content completed, IA’s done. You can sign off your 4PSOW on Tuesday and from now on it’s revise, revise, revise.
Tomorrow we’ll set up our revision folders, and I’ll release the first two past papers. These are your tasks to complete each week, and are to be done to the best of your ability, without cheating!
We will mark each week’s papers using the markschemes.Learn from your mistakes and highlight areas of weakness.
1. Do not print the papers – read them as pdf. Conserve paper!
2. I’ll give you copies of MC answer grids to use.
3. You can print only the pages with diagrams and measurements, and stick them in your notes.
4. Write all your answers on lined paper.Practice completing the exam in the allotted time.
5. Look for trends in favourite question topics.
6. If you hit a topic you don’t understand, use it as an opportunity to revise – check those notes and make sure your essential biology library is complete.
7. Take care to erase questions from older papers that don’t apply to our syllabus – you should be able to cross-check them with the assessment statements.
8. Go through your handbook again, and check off all the assessment statements. Rip out the pages for options we’re not studying. Recycle them.
9. Build libraries of the following:
– definitions and key terms (the marks are in the correct use of language, as shown by the markschemes)
– diagrams and labels
– calculations and examples
10. Pace yourself. Leaving your work until the last minute will not work. Just 6 weeks to go!
11. Teach each other, but do not be a parasite to your friends. If you can explain concepts to others and lead them to understand it, you are doing well.
12. Check out some review skills here.
13. Evaluate your revision techniques – just because you like it does not mean it works.
14. Don’t waste forever colouring in nice pictures of things you already know. Tackle the hard stuff. Learn!
Final topic for the HL Students!
Essential Biology E6: Further Studies of Behaviour
Animations and Resources:
Inside the Hive (PBS): Colony structure
EO Wilson: Lord of the Ants (PBS)
Richrad Dawkins explains the Selfish Gene:
Turtles rely on lunar cycles for nesting:
Seasonal cycles can be affected by climate change:
Circadian rhythms are daily cycles:
Tutorial from WHFreeman
Hamsters will self-select optimal light conditions
Sleep/ wake patterns are genetic in basis:
Colony collapse Disorder (non-syllabus)
“No one villian behind honey-bee colony collapse” from Science News
– What causes CCD? from Bayer CropScience
Video: Collapse of the Honeybee, by Rowan Jacobsen
Additional Higher Level:
Essential Biology: 7.3 & 7.4 Transcription & Translation AHL
Transcription Details (fits DP Bio HL very well)
Translation Details (fits DP Bio HL very well)
MrHardy’s Wikispace (original author unknown):
Transcription (great for HL)
Translation (great for HL)
John Kyrk: (visit the parent site at www.johnkyrk.com – excellent)
Transcription (fits DP Bio HL very well)
Translation (fits DP Bio HL very well)
St. Olaf College
Transcription (clear and simple)
Translation (clear and simple)
RNA Splicing tutorial (HL only)
Translation with a genetic code dictionary (shows position in the ribosome)
Some more in-depth animations (newly added):
Translation from Wiley Interscience
Translation from LSU Medschool
Translation from The Chinese University in Hong Kong
Protein targeting from Rockefeller University
Blame it on the DNA, from the Stanford Students: