1) All living organisms, including bacteria, plants, humans andother animals, are made up of one or more cells. Explain why allliving organisms need to have DNA. Include the words genes andproteins in your explanation.
2)Explain how a difference in the sequence of nucleotides in agene could result in one boy being albino and the other boy havingnormal skin and hair color.
3)Copy and complete this chart to describe how a person's DNAdetermines whether he has hemophilia. (Hint: begin by completingthe bottom box in the protein column.)
Gene in DNA | Protein | Characteristic |
| | Normal formation of blood clots prevents excessive bleeding. |
| | Hemophilia (excessive bleeding because clots do not formnormally because one type of clotting protein is defective) |
4) Explain why a cell needs to replicate its DNA before the celldivides into two daughter cells.
