Genetics and chromosomes

Today we're going to keep looking at genetics.  Answer the following in your books:

1. Complete the activity here. What is the 'stop-codon'?
2. Watch this animation. What enzyme produces mRNA from the DNA which makes up the Luc gene?
3. Replicate some DNA. What do the holes in the bases represent?
4. For number 3, how long would it take you to build an entire DNA strand at your current pace?
5. What are histones? Why are they important?
6. What length of DNA is there in your body?
7. Explain how Down's syndrome is caused.  List both causes and effects of the condition.
8. Briefly explain what non-disjunction is, and state what consequences it can have.
9. Describe the problem with this human karyotype. What gender is the person with this DNA?
10. Watch this video, explaining how the goats are different from 'normal' goats.  What would scientists use to break the DNA and insert new genes?