Focus Lesson You are working on the Diagram Column Use your notebook as a reference. NO TEXT BOOKS.

How do cells divide to create genetic diversity? Essential Question How do cells divide to create genetic diversity? Daily Objectives: SWBAT compare and contrast different types of haploid and diploid cells including gametes, somatic cells, and zygotes. SWBAT explain why meiosis causes genetic variation as a result of crossing over, sorting, and recombining of genes

How will we get there? Lab- page 22 DNA replication Last Class This Class Lab- page 22 DNA replication Homework was due page 23 DNA replication DNA replication activity Quiz #4- DNA replication Corrections/ Enrichment Meiosis notes- pg 41 Meiosis pictures- pg 40

Home learning is LEARNING! If your notebook is not complete through page 37 you’re behind! Please catch it up! www.edwhitebiology.weebly.com

DNA Replication Activity Take the card you were given. If you need to review what that is please look on pages 35 and 37 in your notebook. We will now demonstrate the process of DNA replication. ENGAGEMENT LEVEL SHOULD BE 100% Out of your seats please! 

Create nucleotides! As many as we can. First Create nucleotides! As many as we can. Remember a nucleotide is a phosphate, 5 carbon sugar, and a nitrogen base Where are nucleotides located within the eukaryotic cell?

Let’s make this strand of DNA: Next Let’s make this strand of DNA: C-A-G What would the complementary strand be? Remember the rules of base pairing!!!

We now have a double strand of DNA. Next G- T- C These nucleotides should be added. We now have a double strand of DNA. This is in the nucleus of your cells.

Time to replicate the DNA When in the cell cycle does DNA replication occur? Synthesis of Interphase What must happen first to our DNA double strand? It must be separated into two strands by the enzyme- Helicase

Next Step- Unzip the genes! Helicase needs to break the bonds that hold the base pairs together. What are those bonds? Hydrogen Bonds

2 separated complementary strands Result 2 separated complementary strands Which enzyme is now going to attach to each template strand to build more DNA? DNA polymerase

DNA Polymerase You need to determine which nucleotides in the nucleus need to be added to each template/ strand. Proofread your work!

What are the final products? Results? Two Identical Strands Each containing half of the original and half new Semi-conservative replication

Quiz #4 DNA replication- page 39 Clear your desks Volume level zero You will have 10 minutes When you are done turn your quiz over and sit quietly.

Let’s grade! Take a colored writing utensil out of your box. Put a check if the answer is right and an X if the answer is wrong. If it is wrong please indicate the correct answer for the student’s paper which you are grading.

Corrections Or Enrichment page 38 Corrections- 60% or below Enrichment S Statement: What is the correct answer? R Reason: Why is that answer correct? E Evidence: What page in your notebook did you find the correct answer? Use the following DNA segment: ATTCGG Find the complementary strand. Replicate the DNA. Diagram the end products. Describe the enzymes involved.

Let’s predict! Think- pair- share Why aren’t ALL siblings with the same parents twins? My brother and I look alike, but we are NOT twins even though we have the same parents. Time to learn about MEIOSIS!

Notes: MEIOSIS (on page 41) 3 Types of Cells in the body- Gametes- haploid sex cells (eggs, sperm) Somatic cells- diploid body cells that make up most of your body (heart, liver). Zygote- cell that forms when a male gamete fertilizes a female gamete. Which type of cell listed above can not be found in males?

Vocab Reflection We are going to use Page 40 to reflect on our notes today. Let’s set it up together. IT IS IMPORTANT THAT YOU FOLLOW ALONG AS I DO THIS UNDER THE DOCUMENT CAMERA.

Page 40: Vocabulary Reflection Type of Cell: Synonym: How many sets of chromosomes Example(s) Gamete Somatic Cell Zygote

Check your work Type of Cell: Synonym: How many sets of chromosomes Example(s) Gamete Sex Cell 1 set Egg, Sperm Somatic Cell Body Cell 2 sets Heart, Liver, Kidney, Brain, Stomach, etc. Zygote Fertilized Cell NA

Needed for sexual reproduction Continuing on Page 41 Meiosis Needed for sexual reproduction Cell division which produces gametes (egg, sperm) which are haploid cells

IS INTERPHASE PART OF MEIOSIS? WHY OR WHY NOT Stages of MEOSIS IS INTERPHASE PART OF MEIOSIS? WHY OR WHY NOT Interphase: Preparing for cell division DNA Replicates during synthesis CELL NOT DIVIDING Prophase I: Homologous Chromosomes pair up. Crossing over can occur.

Please Continue… Metaphase I: Homologous chromosomes pair up in middle (homo means same) That means TWO sets of Xs! One from your Mom one from your Dad (both code for same trait) Anaphase I: Homologous chromosomes are pulled APART (Dad’s chromosome goes to one side, Mom’s to the other) Telophase I/ Cytokinesis: Cell membrane starts to pinch creating 2 daughter cells genetically different! Address misconception of homologous meaning just color

Reflect on Concept: Meiosis I Diagram This diagram is on page 174 of the textbook Reflect on Concept: Meiosis I Diagram Paste in the guide to help organize your drawings. (I will demonstrate) Diagram each phase of Meiosis I that you just took notes about. Use color! Interphase Prophase I Metaphase I Telophase I and Cytokinesis Anaphase I

Meiosis 2- looks like mitosis Prophase II- chromosomes condense/ organize Metaphse II- chromosomes line up in the middle of the cell Anaphase II- sister chromatids are pulled apart Telophase II/ Cytokineis- 4 unique haploid daughter cells/ gametes are formed

Reflect on the Concept Diagram Meiosis II Flip your guide open to find the stages of Meiosis II. Use your notes, the PowerPoint, or the textbook to complete your drawings. USE COLOR Telophase I and Cytokinesis I Metaphase II Anaphase II Telophase II and Cytokinesis Prophase II

Vocabulary for page 42 Crossing over: When homologous chromosomes exchange genetic information during meiosis I (How can you show this with the beads?) Homologous chromosomes: Chromosomes that have the same genes (eye color), even if the alleles are different (brown, hazel, blue) DRAW PICTURES!!!!!

Time for independent practice Meiosis practice hand out- page 29 Volume level 0 Raise you hand if you have any questions. YOU CAN DO THIS!!!!

Exit Ticket: POST IT STYLE Pick one of the daily objectives and explain it in words that an elementary school student would understand. SWBAT compare and contrast different types of haploid and diploid cells including gametes, somatic cells, and zygotes. SWBAT explain why meiosis causes genetic variation as a result of crossing over, sorting, and recombining of genes