Yamile
Erick Amrita
LilaKenny
CassandraHajar
Martely
Imani
OliviaMartin
Bryan
Nathy
Javier
Devin
LorenaAlerteLennin
Victor
Joshua
Daysia
Emiliano
Jesse9A – New Seats Front of roomIf you have a question or concern let me know at the END of class – stay in this seat for today.
Joelle
Beverly
Naidaliz
Bio 9A: Tuesday, 2.1.11Transition to Semester 2 Homework:
Read pages 291-296 and take active reading notes. Summarize DNA’s structure and how DNA, genes,
nucleotides, and chromosomes relate to each other. Silent Do Now:
Complete the Semester 1/Midterm Exam Reflection Today’s Objectives:
Reflect on Semester 1 and the Midterm Exam Provide feedback and set goals for Semester 2 Identify your current knowledge and questions
about genetics.
Preview of Genetics:DNA, Genes, and Chromosomes
Count off by 6’s Tables in the back (2 for each word)
DNA Genes Chromosomes
At your table: Put your assigned word on a poster and divide the
page in two One side: Write down everything you know about
the word Other side: Write down questions you have
After 5 minutes your group will rotate to the other tables to add to the other posters
Yamile
Erick Hajar
LilaKenny
CassandraAmrita
Martely
Imani
OliviaMartin
Bryan
Nathy
Javier
Devin
LorenaAlerteLennin
Victor
Joshua
Daysia
Emiliano
Jesse9A – Reminder of New Seats Front of room
Joelle
Beverly
Naidaliz
Bio 9A: Thursday, 2.3.11Title: DNA Structure & Function
Homework: Read pages 297-299 and take active reading notes. Summarize how DNA replicates!
Silent Do Now – on the worksheet Study the diagram of Genetic Information in Cells. Answer the Fill-in-the-Blanks on the back of the
diagram Pass your Semester 1 Reflection packet forward if you
didn’t hand it in on Tuesday Today’s Objectives:
Explain how DNA, genes, nucleotides, and chromosomes relate to each other.
Describe the structure of DNA.
INTRODUCTION TO GENETICS:DNA – STRUCTURE & FUNCTION
PHA Biology 9Moretti/ Dickson
Intro to Genetics:DNA Structure & Function Genetics: the study of heredity
What determines an organism’s traits (characteristics)?
How are traits passed on from one cell to another, and from parents to offspring?
DNA: the molecule that carries genetic information
DNA has two important functions: Carry instructions for making proteins that
determine your traits Replicate – make exact copies of itself so it can
be passed on DNA is found in all cells (in the nucleus in
eukaryotic cells)
DNA
ChromosomesVery long, coiled/bunched up strands of DNA that contain many genes
Gene: Instructions for making a protein that determines a traitAnother Gene:
instructions for making a different protein that determines a different trait
Nucleotide Base PairsBuilding blocks of DNA
Do Now: Genetic Info in Cells
DNA Structure
Objectives for Class:Describe the structure of DNA.
DNA Structure “Building Blocks” = Nucleotides
Deoxyribose Sugar Phosphate Nitrogenous Base
DNA Polymer = chain of nucleotides Ladder: Uncoiled Double Helix: 2 long coiled strands
Sides: alternating phosphates & sugars
Middle/ “Rungs” of ladder: Pairs of Nitrogenous Bases
connected by Hydrogen bondsObjectives for Class:
Describe the structure of DNA.
DNA Structure: Base Pairing 4 Nitrogen Bases:
Adenine Guanine Thymine Cytosine
• Base Pairing:A ---- THydrogen bonds
connect themG ---- C
Objectives for Class:Describe the structure of DNA.
DNA Structure: Images
Objectives for Class:• Describe the structure of DNA.
Write down this DNA Sequence:
G A T A C A T G C G C T A T G T A C G
C
What is the sequence for the complementary (aka matching) DNA strand?
How do we know about DNA Structure?Don’t need to write this – just listen!
Chargaff: A=T and C=G Rosalind Franklin:
Actual X-ray of DNA Showed double-helix
structure Died young due to X-rays! Didn’t get credit for her
contributions… pretty messed up!
Watson & Crick: Built a model using this evidence (They got all of the credit –
initially)
Objectives for Class:Describe the structure of DNA.
Bio 9A: Friday, 2.4.11Title: DNA Replication & Modeling
Homework: Finish the Discussion Questions for Part 2 of the DNA Lab
Silent Do Now: (in NB w/ title & date)1. Based on yesterday’s class: How do genes,
chromosomes, nucleotides, and DNA relate to each other?
2. Based on last night’s HW: What is the first thing you would need to do with this DNA molecule in order to copy it?
Today’s Agenda & Objectives: Review the Do Now – how genes, chromosomes, etc. relate Describe the steps of DNA replication (very brief notes) Build a model of DNA and use it to show how DNA replicates
(Modeling-Building Lab)
Do Now Review Volunteers to read aloud their answer to
#1 of the Do Now? Grade your answer out of 3 points:
Nucleotides are the building blocks of DNA – they come together to form DNA
One piece of DNA (used to make one protein) is a gene
A long piece of DNA containing many genes is a chromosome
DNA Replication: Overview DNA can make an
exact copy of itself!
Occurs every time a cell needs to reproduce
Objectives for Class:Describe the structure of DNA.
DNA Replication: Overview
Steps of DNA Replication1. DNA Unwinds & Unzips:
Hydrogen Bonds break Separates into 2 single
strands2. DNA Polymerase adds
complementary (matching) nucleotides to each side(templates)
3. Finished Product: 2 NEW identical double-strands of DNA are produced DNA Polymerase “proofreads”
the new strands Each new strand twists back
up to form 2 double helicesObjectives for Class:• List the steps of DNA replication
DNA Replication
Objectives for Class:• Identify
Note: The RED Strand is the Original Strand
DNA Model Building Lab: Part I
Part I: Constructing DNA Build 36 nucleotides:
Count out the following and put the rest in a pile for later:
5 A 5 T 4 C 4 G Build a double-stranded DNA
molecule with these 18 nucleotides
Record your DNA Sequence in the table
Then answer the questions and go on to Part 2
Objectives for Class:• Describe the structure of DNA.
phosphatesugar
Nit.base
Partners for DNA Modeling LabYour partner is at your same table, not across from you!Olivia AlerteJoshua Cassandra
DaysiaMartelyBeverly Imani
Nathy Joelle Lorena
Victor BryanLila
Devin AmritaYamileKenny
Erick HajarJavier Naidaliz
Jesse MartinLenninEmiliano
DNA Model Building Lab: Part II
Part II: Replicating DNA “Unzip” your DNA sequence by “breaking” the
hydrogen bond between the two nitrogenous bases. Observe your two separate strands. Using the other pieces in your kit, create two new strands of DNA – nucleotide by nucleotide.
Note that when the DNA molecule splits in half, new complimentary bases attach to the separated strands creating two new strands of DNA. Be sure your base pairs match!
Be sure to construct your new DNA strand by adding nucleotides to the original templates!
When finished: Take all pieces apart and put
them back in the bags Answer the Discussion
Questions for Part 2
Objectives for Class:• Describe the structure of DNA.• Explain WHY DNA must replicate and the 3 steps of HOW DNA replicates.
Lila
Martin
Devin
JoelleEmiliano
Yamile
BeverlyHajar
Javier
Kenny
Lorena
Amrita
Naidaliz
Imani
Bryan
Cassie
Olivia
LenninJesse
ErickDaysiaJoshua Nathy Martely
9A – Seats for Today
Victor
Alerte
Bio 9A: Monday, 2.7.11Title: Wrap-Up: DNA Structure & Replication
Homework: Read Section 10-2 (pgs. 244-249) Take notes – see Q’s on assignment sheet
Silent Do Now: (in NB w/ title & date)1. Write the complementary base sequence to this single
strand of DNA2. Which of the pictures below best illustrates DNA replication?
Why?
G A A C G T
A. B. C.
Take out your DNA Modeling Lab… Check to be sure that all questions are
complete Did you label everything that’s supposed to
be labeled? Did you answer all parts of every question? If yes: Pass it forward If no: Hold onto it, fix it after hearing the
instructions for today
Wrap-Up:DNA Structure & ReplicationToday’s Objective: Solidify your knowledge
of last week’s goals! Describe the
structure of DNA. Explain how DNA,
genes, nucleotides, and chromosomes relate to each other
Describe the steps of DNA replication
Explain how DNA’s structure allows it to replicate.
How you will do this: DNA Review Activities
You must complete at least 1 activity to get a passing grade
Complete more than one to earn a B or an A
Work silently on your own for 20 minutes, then permission to work with a partner
If you don’t finish in class, it is due Thursday.
Reminder: Tonight’s HW = Read 10.2 and answer questions
