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Meiosis And Variation (Potato Head)

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Delcastle Technical High School

The document discusses several key aspects of sexual reproduction and genetics: 1) Humans have 23 pairs of chromosomes that are inherited from each parent, with one chromosome from each pair coming from the mother and the other from the father. 2) Meiosis involves the production of gametes (sex cells) that have half the normal number of chromosomes to allow for variation when they fuse during fertilization. 3) Genetic variation arises through several processes in meiosis and sexual reproduction, including independent assortment of chromosomes, crossing over, and random fertilization.

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1- How does DNA work? 2- How is a persons DNA passed on to their children? 3- What is the difference between how cells divide and humans reproduce? Passing Notes
There are 46 pieces of DNA or CHROMOSOMES in human beings ( diploid number) X Y 23 pairs of chromosomes. One of each pair is from MOM, other from DAD!
 
 
 
 
Sexual Reproduction, Variation, and Meiosis
-Understand why sexual reproduction is advantageous to individuals of a specific species. -Given a diagram of male and female cells, each having two pairs of chromosomes, the student will:  diagram the four possible gametes from the male and female cells.  explain why it is necessary for the number of chromosomes in the gametes to be half that of the parent cell.  explain how meiosis promotes genetic diversity in the offspring at fertilization. The Objective
-meiosis - chromosome -chromatid -haploid -diploid -variation -random segregation / independent assortment -random fertillization -crossing over -natural selection Vocabulary
Why Sex? Why is it an advantage/adaptation for a species to reproduce sexually versus asexually?
A human egg surrounded by sperm - one of which will fertilize it http://www.bbc.co.uk/schools/gcsebitesize/biology/variationandinheritance/1reproductionandgenderrev5.shtml
 
ACTIVITY: Mr. Potato Head
 
Step 3.
 
 
Variation?
Why Sex?
Why is sexual reproduction better? Evolution : “The Advantage of Sex” “ Hitting a moving target…”
Why is sexual reproduction better? Evolution : “The Advantage of Sex” Use the analogy of the “ Red Queen ” to explain why sexual reproduction is advantageous.
Face Lab 01-13-2002                           
Face Lab A study of human genetics - In this activity you will perform a simulation to study how facial characteristics are inherited. - You will follow the basic Mendelian Laws of Inheritance to detemine your childs genotype and then draw their phenotype .
Face Lab Vocabulary gene allele genotype phenotype dominant recessive sex chromosomes
Face Lab Inheritance Patterns Dominant Recessive Incomplete Dominance Codominance Polygenic Sex-linked Traits
Face Lab General Genotype Rules 1- Genes come in pairs. (one from each parent) 2- Use letters to represent genes. 3- Dominant vs Recessive 4- Homozygous vs Heterozygous
Variations on a Human Face Face Lab Genotype Data Table Checklist for Phenotypes Phenotype Illustrations
  THE ASSIGNMENT : make a 30 second commercial which explains and “sells” the answer to the question or topic you were assigned. You will perform tomorrow. HINTS : commercial can be a jingle, you can act out a scene, use propts / signs. MANDATORY : You must use the bold words in the question and you must correctly explain the concept – “sell it!”   Sexual Reproduction and Variation Commercials
Group 1: Explain why sexual reproduction is better than asexual reproduction in terms of survival and natural selection . ( variation ) Group 2: Why is meiosis necessary for organisms that reproduce sexually ? (Explain how meiosis creates gametes or sex cells with half the normal number of chromosomes ) Group 3 : In meiosis , independent assortment of chromosomes , is a source of variation . Explain how this works and when it happens in meiosis Group 4: Crossing over of chromosomes is another source of variation . Explain what crossing over is and how it happens. (talk about the exchange of genes between homologous chromosomes ) Group 5: Random fertilization is also a source of variation in sexually reproducing organisms. Explain why this is a source of variation . Group 6: Meiosis is really complicated explain how it is similar and different from mitosis . (include info about chromosome number ( diploid / haploid )) Sexual Reproduction and Variation Commercials
  Group 1: Explain why sexual reproduction is better than asexual reproduction in terms of survival and natural selection . ( variation )     Sexual Reproduction and Variation Commercials
    Group 2: Why is meiosis necessary for organisms that reproduce sexually ? (Explain how meiosis creates gametes or sex cells with half the normal number of chromosomes )     Sexual Reproduction and Variation Commercials
  Group 3 : In meiosis , independent assortment of chromosomes , is a source of variation . Explain how this works and when it happens in meiosis   Sexual Reproduction and Variation Commercials
  Group 4: Crossing over of chromosomes is another source of variation . Explain what crossing over is and how it happens. (talk about the exchange of genes between homologous chromosomes )   Sexual Reproduction and Variation Commercials
  Group 5: Random fertilization is also a source of variation in sexually reproducing organisms. Explain why this is a source of variation .   Sexual Reproduction and Variation Commercials
  Group 6: Meiosis is really complicated explain how it is similar and different from mitosis . (include info about chromosome number ( diploid / haploid )) Sexual Reproduction and Variation Commercials
3 persons per group / Numbered 1-3 / Each person answers a question and passes the note to the next person who answers the next one, until all are done. 1- How does DNA work? 2- How is a persons DNA passed on to their children? 3- What is the difference between how cells divide and humans reproduce? Passing Notes

More Related Content

Meiosis And Variation (Potato Head)

  • 1.  
  • 2. 1- How does DNA work? 2- How is a persons DNA passed on to their children? 3- What is the difference between how cells divide and humans reproduce? Passing Notes
  • 3. There are 46 pieces of DNA or CHROMOSOMES in human beings ( diploid number) X Y 23 pairs of chromosomes. One of each pair is from MOM, other from DAD!
  • 4.  
  • 5.  
  • 6.  
  • 7.  
  • 9. -Understand why sexual reproduction is advantageous to individuals of a specific species. -Given a diagram of male and female cells, each having two pairs of chromosomes, the student will:  diagram the four possible gametes from the male and female cells.  explain why it is necessary for the number of chromosomes in the gametes to be half that of the parent cell.  explain how meiosis promotes genetic diversity in the offspring at fertilization. The Objective
  • 10. -meiosis - chromosome -chromatid -haploid -diploid -variation -random segregation / independent assortment -random fertillization -crossing over -natural selection Vocabulary
  • 11. Why Sex? Why is it an advantage/adaptation for a species to reproduce sexually versus asexually?
  • 12. A human egg surrounded by sperm - one of which will fertilize it http://www.bbc.co.uk/schools/gcsebitesize/biology/variationandinheritance/1reproductionandgenderrev5.shtml
  • 13.  
  • 15.  
  • 17.  
  • 18.  
  • 21. Why is sexual reproduction better? Evolution : “The Advantage of Sex” “ Hitting a moving target…”
  • 22. Why is sexual reproduction better? Evolution : “The Advantage of Sex” Use the analogy of the “ Red Queen ” to explain why sexual reproduction is advantageous.
  • 23. Face Lab 01-13-2002                           
  • 24. Face Lab A study of human genetics - In this activity you will perform a simulation to study how facial characteristics are inherited. - You will follow the basic Mendelian Laws of Inheritance to detemine your childs genotype and then draw their phenotype .
  • 25. Face Lab Vocabulary gene allele genotype phenotype dominant recessive sex chromosomes
  • 26. Face Lab Inheritance Patterns Dominant Recessive Incomplete Dominance Codominance Polygenic Sex-linked Traits
  • 27. Face Lab General Genotype Rules 1- Genes come in pairs. (one from each parent) 2- Use letters to represent genes. 3- Dominant vs Recessive 4- Homozygous vs Heterozygous
  • 28. Variations on a Human Face Face Lab Genotype Data Table Checklist for Phenotypes Phenotype Illustrations
  • 29.   THE ASSIGNMENT : make a 30 second commercial which explains and “sells” the answer to the question or topic you were assigned. You will perform tomorrow. HINTS : commercial can be a jingle, you can act out a scene, use propts / signs. MANDATORY : You must use the bold words in the question and you must correctly explain the concept – “sell it!”   Sexual Reproduction and Variation Commercials
  • 30. Group 1: Explain why sexual reproduction is better than asexual reproduction in terms of survival and natural selection . ( variation ) Group 2: Why is meiosis necessary for organisms that reproduce sexually ? (Explain how meiosis creates gametes or sex cells with half the normal number of chromosomes ) Group 3 : In meiosis , independent assortment of chromosomes , is a source of variation . Explain how this works and when it happens in meiosis Group 4: Crossing over of chromosomes is another source of variation . Explain what crossing over is and how it happens. (talk about the exchange of genes between homologous chromosomes ) Group 5: Random fertilization is also a source of variation in sexually reproducing organisms. Explain why this is a source of variation . Group 6: Meiosis is really complicated explain how it is similar and different from mitosis . (include info about chromosome number ( diploid / haploid )) Sexual Reproduction and Variation Commercials
  • 31.   Group 1: Explain why sexual reproduction is better than asexual reproduction in terms of survival and natural selection . ( variation )     Sexual Reproduction and Variation Commercials
  • 32.     Group 2: Why is meiosis necessary for organisms that reproduce sexually ? (Explain how meiosis creates gametes or sex cells with half the normal number of chromosomes )     Sexual Reproduction and Variation Commercials
  • 33.   Group 3 : In meiosis , independent assortment of chromosomes , is a source of variation . Explain how this works and when it happens in meiosis   Sexual Reproduction and Variation Commercials
  • 34.   Group 4: Crossing over of chromosomes is another source of variation . Explain what crossing over is and how it happens. (talk about the exchange of genes between homologous chromosomes )   Sexual Reproduction and Variation Commercials
  • 35.   Group 5: Random fertilization is also a source of variation in sexually reproducing organisms. Explain why this is a source of variation .   Sexual Reproduction and Variation Commercials
  • 36.   Group 6: Meiosis is really complicated explain how it is similar and different from mitosis . (include info about chromosome number ( diploid / haploid )) Sexual Reproduction and Variation Commercials
  • 37. 3 persons per group / Numbered 1-3 / Each person answers a question and passes the note to the next person who answers the next one, until all are done. 1- How does DNA work? 2- How is a persons DNA passed on to their children? 3- What is the difference between how cells divide and humans reproduce? Passing Notes