Say It! - Year 11 Science: DNA

Use p10-11 of The Gene Seekers by Bill O'Brien to answer these questions.

	A	B	C	
1	Where is DNA found in a cell?	What are chromosomes made of?	What is the base-pairing rule?	
2	Explain how sex is determined in humans.	Explain why DNA is sometimes described as being like a “twisted ladder”.	Explain how genes are related to DNA.	
3	If every cell of one organism contains the same genetic information, why don’t all cells look the same and have the same functions?	What feature of the structure of DNA differs from one gene to the next?	Discuss how a change in the base sequence of a stretch of DNA could affect the functioning of a cell.	

Contributed by Madeleine Ware.