Back: Life Science Assignments

(For extra credit ask to add creative commons pictures to these notes and the URL from which you got the picture.
Better still give me your drawings to add to these notes.)

4_3 DNA's Structure Notes (Two Columns)
DNA:
1. is a long, thin, double stranded molecule

2. duplicates before cell division

3. forms into two attached chromatids for mitosis and meiosis

4. contains information in a code

5. DNA's structure was shown as two chains of molecules in a spiral form by an x-ray picture taken by Rosalind Franklin

6. A model of DNA was made by Watson and Crick using Franklin's x-ray

7. Structure of DNA: looks like a twisted ladder or a double helix

8. Structure of DNA: The sides of the ladder are made of a sugar (deoxyribose) molecule and a phosphate group.

9. Structure of DNA: The steps of the ladder are made up of nitrogen bases.

10. Nitrogen Base amounts: Adenine always equals thymine and cytosine always equals guanine

11. Equal amounts indicated that nitrogen bases occur in pairs in the rungs of the ladder.

Polyploidy Questions p. 108
Write the question or answer in complete sentences using part of the question. Your choice.

1. What do you receive from each of your parents?
2. What does having two sets of chromosome make you?
3. What is polyploidy?
4. What causes polyploidy?
5. What makes plants with polyploidy valuable?
6. What often occurs in plants with an odd number of chromosome sets?
7. Define haploid and diploid.

Read pages 110 and 111 when finished