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Set up Cornell Notes on pg. 63 Topic: 6.1 Chromosomes and Meiosis Essential Question :

6.1 Chromosomes and Meiosis. 2.1 Atoms, Ions, and Molecules. Set up Cornell Notes on pg. 63 Topic: 6.1 Chromosomes and Meiosis Essential Question : Where are germ cells located in the human body?. Where are germ cells located in the human body?.

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Set up Cornell Notes on pg. 63 Topic: 6.1 Chromosomes and Meiosis Essential Question :

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  1. 6.1 Chromosomes and Meiosis 2.1 Atoms, Ions, and Molecules Set up Cornell Notes on pg. 63 • Topic: 6.1 Chromosomes and Meiosis • Essential Question: • Where are germ cells located in the human body? • Where are germ cells located in the human body? Key Concept: Gametes have half the number of chromosomes that body cells have

  2. XX XY Pg. 62 Germ Cells Somatic Cells Points to Ponder

  3. With a partner from your table: • Please use pgs. 168-171 in your text book • USE PENCIL • Complete the tree map of chromosomes (2 branches) • Complete the table contrasting: Somatic/Germ Cells

  4. KEY CONCEPT Gametes have half the number of chromosomes that body cells have.

  5. Mom Dad • Human body cells have 23 pairs of chromosomes and 46 total • Each pair of chromosomes is called Homologous pairs and have copies of the same genes • In each pair, one chromosome comes from each parent. *Homo= same

  6. You have two types of chromosomes: Autosomes and Sex Chromosomes

  7. Chromosome pairs 1-22 are called autosomes • Contain genes not directly related to your gender

  8. Pair #23=Sex chromosomes: X and Y • determine gender • Control the development of sexual characteristics XX= female XY= male XX P. 62: Draw a picture to help you remember XX/XY XY

  9. You have two types of specialized cells: Somatic cells andGerm cells Will become… Draw a picture on the middle of pg. 62 to help you remember somatic vs. germ cells

  10. Somatic cells- are body cells, and make up most of your body tissues and organs. • Liver cells • Lung cells • Heart cells etc… Red blood cells skin cells bone cells intestinal cells

  11. Somatic (body) cells are Diploid (2n) • They have two copies of every chromosome (23 from mom, 23 from dad) • for a TOTAL of 46 chromosomes • Undergo mitosis *di= 2 n (sperm) n (egg) 2n

  12. Germ cells- are the cells in your reproductive organs • located in the ovaries and testes • Develop into gametes through meiosis

  13. Gametes are sex cells: egg and sperm • Both have DNA that can be passed to offspring. Egg Sperm

  14. Gametes are Haploid (n) cells have one copy of every chromosome. • Have 22 autosomes + 1 sex chromosome = 23 chromosomes each • Each gamete is UNIQUE 23 23

  15. Chromosomes Autosomes Sex Chromosomes Sets 1-22 Set 23 Not directly related to gender X Y Determines gender Controls sexual characteristics

  16. Undergo meiosis • Cells in reproductive organs (ovaries/testies) • Become gametes (sperm/eggs) • Haploid • 23 chromosomes • Each are Unique • Undergo mitosis • body cells • Diploid • 46 chromosomes • Identical to parent cell • You have two types of specialized cells: Somatic cells Germ cells

  17. Points to Ponder • Where are germ cells located in the human body (2 places) • Do you think that Y chromosomes contain genes that are critical for an organism’s survival? Explain.

  18. Points to Ponder • Where are germ cells located in the human body (2 places) • In the reproductive organs: The ovaries in women and the testes in men. 2. Do you think that Y chromosomes contain genes that are critical for an organism’s survival? Explain. • No, a Y chromosome is not necessary for survival. Females do not have a Y chromosome, and they are able to survive.

  19. 6.1 Mitosis vs. Meiosis 2.1 Atoms, Ions, and Molecules Set up Cornell Notes on pg. 65 • Topic: 6.1 Mitosis vs. Meiosis • Essential Questions: • Does mitosis or meiosis occur more frequently in your body? Explain. • Draw a double-bubble map comparing and contrasting mitosis and meiosis (pg. 64) • Does mitosis or meiosis occur more frequently in your body? Explain. • Draw a double-bubble map comparing and contrasting mitosis and meiosis

  20. Pg. 64 EQ#2: Mitosis Meiosis “Genetic Data Chromosome Interpretation”

  21. Pg. 65 Mitosis Meiosis

  22. Mitosis= makes more diploid cells. • Produces genetically identical cells • Results in diploid cells (2 sets of chromosomes) • 46 chromosomes in each cell • Takes place throughout an organism’s lifetime • Involved in asexual reproduction • Somatic (body) Cells

  23. *Draw on pg. 65 in mitosis column DNA replicates 2 identical daughter cells

  24. Meiosis= makes haploid cells (23) from diploid cells • Produces genetically unique cells • Results in haploid cells (1 set of chromosomes) • 23 chromosomes in each gamete • Takes place only at certain times in an organism’s life cycle • Involved in sexual reproduction • Germ cells (sex cells)

  25. (diploid- 46) Germ cell *Draw on pg. 65 in meiosis column 4 haploid (23) unique daughter cells

  26. Homework: Due by Tuesday 10/28!!!! Work on vocab on pg. 68-69 of INB You need each vocab word- as well as a mini pic and description • 6.1 • Sexual reproduction • Fertilization • Meiosis • 6.4 • Gene • Allele • Homozygous • Heterozygous • Genome • Genotype • Phenotype • Dominant • Recessive • 6.3 • Traits • Genetics • Purebred • 6.2 • Sperm • Egg

  27. Classwork EQ: Make a double-bubble Map comparing and contrasting mitosis and meiosis on the top of Pg. 64. • Please read the Genetic Data information • Interpret the second bar graph and answer the 3 questions on the bottom of pg. 64 • Title it “Genetic Data Chromosome Interpretation” Data Analysis: Please open your book to page 172

  28. Diploid # of Chromosomes in Various Organisms Y- axis Dependent variable 210 10 20 40 49 55 40 X- axis Independent variable

  29. King crab; fruit fly • No. A porpoise is much bigger than a king crab, and has far less chromosomes. A potato is only 3 chromosomes off from human, and far smaller. • Yes. Chromosomes need to be able to fit in the nucleus.

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