SU: DNA The diagram shows Rosalind Franklin’s x-ray diffraction image of DNA. How did this...

SU: DNA• The diagram shows Rosalind

Franklin’s x-ray diffraction image of DNA. How did this evidence affect the work of Watson and Crick?– A. It was used to determine the

physical structure of DNA.

– B. It was used to identify the four bases that make up DNA.

– C. It was used to develop the theory of independent assortment.

– D. It was used to show that DNA was the molecule of inheritance.

Class Business• Gattaca Essay Due tomorrow – 30 HP!

• Writing across the curriculum prompt due tomorrow: – In one paragraph describe photosynthesis!

• Outline 12-2 Due on Tuesday (5HP)

• Reading Quiz 12-2 on Tuesday

• Outline 12-3 Due Thursday (10HP)

• Reading Quiz 12-3 on Friday

HOMEWORK• Gattaca Essay Due tomorrow – 30 HP!

• Writing across the curriculum prompt due tomorrow: – In one paragraph describe photosynthesis!

• Outline 12-2 Due on Tuesday (5HP)

• Reading Quiz 12-2 on Tuesday

• Outline 12-3 Due Thursday (10HP)

• Reading Quiz 12-3 on Friday

SU: Base-Pairing• Which base sequence in DNA is

complementary to the base sequence TATCGG–A. ATAGCC–B. UCUATT–C. GCGUTT–D. ATACAA–Hint: Use Chargaff’s Rule

Classroom Business• GATTACA Essay/ Genetic Engineering

Essay

• Writing across the curriculum: In one paragraph describe the process of photosynthesis

• Outline 12-2 Due Tuesday, Quiz Tuesday

• Outline 12-3 Due Thursday, Quiz Friday

• No school tomorrow.

• Sub on Monday: – Use the workbooks. Section 12-2

DNA – deoxyribonucleic acid

3 Functions of DNA:

1. To store and use information to direct the activity’s of the cell

2. To copy itself exactly in order to form new cells

3. Must be able to pass copies of their DNA to offspring in order to keep species from going extinct

DNA Nucleotides• Made of 3 parts:

1. phosphate molecule

2. sugar molecule – deoxyribose

3. nitrogen base – can be 1 of the 4 below:

- adenine - thymine

- cytosine - guanine

**sugar & phosphate molecules are

ALWAYS THE SAME IN EVERY NUCLEOTIDE

Create your own DNA Molecule

• On the back of your nucleotide handout write..– 3 Red “A” - Adenine

– 3 Green “T” - Thymine

– 3 Blue “C” – Cytosine

– 3 Yellow “G” – Guanine

– 12 Black “Phosphate Groups”

– 12 White “ Sugar” - Deoxyribose

Directions to make your own DNA Model• Follow Chargoff’s Rules!• Step 1: Cut out templates.• Step 2: Cut your nucleotides• Step 3: Pair your nucleotides together.• Step 4: Link them together with the

sugar and phosphate groups. • Step 5: Sit back and look with awe at

your completed DNA molecule.

Answer the following questions in your notebook…

• Choose one side of your DNA molecule to be your leading strand. – What is your final DNA sequence?

• What is your final complementary sequence?– This is the DNA strand that is opposite your leading

strand.

• Make a prediction what would happen if you made a mistake in your DNA molecule. Would the structure be different? Would the nucleotides match?

• What do you think happens when this occurs inside your cells?

HOMEWORK• Gattaca Essay Due tomorrow – 30 HP!

• Writing across the curriculum prompt due tomorrow: – In one paragraph describe photosynthesis!

• Outline 12-2 Due on Tuesday (5HP)

• Reading Quiz 12-2 on Tuesday

• Outline 12-3 Due Thursday (10HP)

• Reading Quiz 12-3 on Friday

SU: DNA Structure• The two chains of a DNA molecule

are held together by bonds between…– A. Base Pairs

– B. Sugars and Phosphates

– C. Amino Acids

– D. Nucleotides

Class Business• Outline 12-2 Due Today• Reading Quiz 12-2 Quiz Today• Outline 12-3 Due Thursday• Reading Quiz 12-3 Friday• DNA Molecule

Review: Structure of DNA

Hydrogen bonds

Nucleotide

Sugar-phosphate backbone

Key

Adenine (A)

Thymine (T)

Cytosine (C)

Guanine (G)

Section 12-1

Go to Section:

Adenine GuanineCytosine Thymine

Phosphate group Deoxyribose

Review: DNA NucleotidesSection 12-1

Go to Section:

Structure of Chromosomes

• Vocabulary–Chromatin

–Histones

DNA Replication

• Vocabulary–Replication

–DNA Polymerase

Homework• Outline 12-3 Due Thursday

• Reading Quiz 12-3 on Friday

3:2:1 Exit Slip• 3 Things you learned today

• 2 Things that you did not expect

• 1 Question for further inquiry