Genetic clues to a healthier future

1.	What problems and benefits could follow from the development of a Gene Chip for analysing a person's DNA?

2.	How would such a Gene Chip work?

3.	a) What are the symptoms of Huntingdon's Chorea?
	b) What are the symptoms of haemophilia?
	c) Explain how each of these diseases is inherited.

4.	What do you understand by the following terms: polymorphism; genetic variability; the double helix?