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Tuesday, November 1 st ! 

Tuesday, November 1 st ! . HSAP is next semester ! Let’s practice with some biology—write your answers in your journal—remember, notebook check coming up VERY soon.

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Tuesday, November 1 st ! 

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  1. Tuesday, November 1st!  HSAP is next semester! Let’s practice with some biology—write your answers in your journal—remember, notebook check coming up VERY soon. You have 5 minutes after the tardy bell RINGS to complete this. That’s it. We’ll go over it tomorrow. GET BUSY and STAY BUSY today. Page 172 in your book “Interpret a Bar Graph” Section, Questions 1-3

  2. 6.1 KEY CONCEPTGametes have half the number of chromosomes that body cells have.

  3. sex cells (egg) body cells sex cells (sperm) YOU have 2 major cell types! Develop from germ cells (In ovaries and testes) Gametes = sex cells (egg and sperm)! DNA IS passed to kids Body cells Most of body tissues, organs NOT passed on to kids

  4. Your cells have autosomes and sex chromosomes! • Your body cells have 23 pairs of chromosomes! • Homologous pairs = same structure. • One chromosome comes from each parent. • Autosomes = chromosome pairs 1-22 • Sex chromosomes = X and Y, determine gender

  5. Let's see... are chroms #1 – 22, NON-sex chroms (have lots of other genes) A Homologous pair = 1 from each parent!! (same genes, but may “code” for diff traits) Pair #23 = Sex chroms = X & Y, genes determine gender!!

  6. What’s the difference here???

  7. DOUBLE DOUBLE HALF • Body cells! • 2 copies of every chromosome • Half the chromosomes comes from each parent! • Gametes! (sperm, egg) • 1 copy of every chromosome: • 22 autosomes • 1 sex chromosome

  8. Body Cells How are these processes alike? Different?? Sex Cells!!!

  9. PAGE 171-- use the chart to complete the comparison!

  10. Body Cells (Somatic) Body Cells

  11. Sex Cells (Gametes)

  12. Review!!! Where are germ cells located in the human body? What’s an autosome? What’s a sex chromosome & how’s it different from an autosome? In a human DIPLOID cell, how many chromosomes are there? In a human HAPLOID cell, how many chromosomes? After fertilization takes place (sperm meets egg), the resulting cell (zygote) is .... Diploid or haploid? Do you think the Y chromosome contains genes that are crucial to the organism’s survival? Does mitosis or meiosis occur more frequently in your body?

  13. 6.2 KEY CONCEPT During meiosis, diploid cells go thru 2 cell divisionsto make haploid cells!!

  14. Meiosis = 2 rounds of cell division!! • Meiosis reduces chromosome number and creates genetic diversity!

  15. Similar, not identical – 1 from each parent (same genes) • Pairs separate in Meiosis I • Copies of the same chromosome! (each = ½ of duplicated chrom, attached @ centromere) • Separate in M. 2 Meiosis I and meiosis II each have four phases, similar to those in mitosis!!

  16. www.classzone.com • Meiosis I • occurs after DNA has been replicated • divides homologous chromosomes into 4 phases.

  17. Turn to p. 174 – 175! Describe the steps of Meiosis!!

  18. Meiosis II divides sister chromatids in four phases. • DNA is not replicated between meiosis I andmeiosis II.

  19. How are they different???? • Meiosis = two cell divisions, mitosis = one • In mitosis, homologous chromosomes never pair up. • Meiosis results in haploid cells; mitosis results in diploid cells.

  20. Haploid cells develop into mature gametes. • Gametogenesis = production of gametes. • Gametogenesis differs between females and males!  • Sperm become streamlined and motile. • Sperm mostly just contribute their DNA to the embryo. • Eggs contribute DNA, cytoplasm, and organelles to an embryo. Go GIRL! • During meiosis, the egg gets most of the contents; the other cells form “polar bodies”.

  21. More Review for you!!! • What is mitosis?? • What is meiosis? • What is a somatic cell?? • What are gametes??? • Examples of gametes??? • Examples of somatic cells?? • What are autosomes?? • Why are the X and Y chromosome special???

  22. And MORE Review for you!!! • What is the difference between haploid and diploid cells?? • What is a homologous chromosome?? • A sister chromatid?? • What is gametogenesis??

  23. Practice Sheet with Gametogenesis! Smart Board Activity Circle Activity for Meiosis Practice!

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