SCI 9 Lesson 2 Mar 17 - Introduction to Genetics (2)

985 views

Published on

Science 9 (1-1 and 2-4)
Introduction to Genetics (2)

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
985
On SlideShare
0
From Embeds
0
Number of Embeds
14
Actions
Shares
0
Downloads
14
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide
  • Mendelian Genetics 03/19/11
  • Mendelian Genetics 03/19/11
  • Mendelian Genetics 03/19/11
  • Mendelian Genetics 03/19/11
  • SCI 9 Lesson 2 Mar 17 - Introduction to Genetics (2)

    1. 1. HOMEWORK FROM LAST CLASS: <ul><li>Complete the Genetics Practice Problems worksheet </li></ul><ul><li>Read over class notes and check out the class blog: http://msoonscience.blogspot.com/ </li></ul>
    2. 2. INTRODUCTION TO GENETICS - REVIEW
    3. 3. <ul><li>Remember me? Who am I? </li></ul><ul><li>I’m Gregor Mendel, the “Father of Genetics”! </li></ul><ul><li>I’m an Austrian monk who studied the inheritance of traits (characteristics) in pea plants. </li></ul>Pea 
    4. 4. VOCABULARY REVIEW
    5. 5. VOCABULARY REVIEW Match the following vocabulary words to the correct number. _________ trait <ul><li>A place on a chromosome that gives information for a protein </li></ul>_________ recessive 2. A physical feature resulting from a genotype _________ heredity 3. A form of a gene _________ genotype 4. The combination of alleles for a trait; represented by 2 letters _________ phenotype 5. The study of heredity _________ dominant 6. The passing of traits from parent to offspring _________ gene 7. An allele that gets masked so it cannot be expressed (unless it is paired with its counterpart allele) _________ allele 8. A characteristic or feature of an organism that can be passed from parent to offspring _________ genetics 9. An allele that masks another, and is always expressed in the phenotype
    6. 6. VOCABULARY REVIEW - ANSWERS Match the following vocabulary words to the correct number. 8 trait <ul><li>A place on a chromosome that gives information for a protein </li></ul>7 recessive 2. A physical feature resulting from a genotype 6 heredity 3. A form of a gene 4 genotype 4. The combination of alleles for a trait; represented by 2 letters 2 phenotype 5. The study of heredity 9 dominant 6. The passing of traits from parent to offspring 1 gene 7. An allele that gets masked so it cannot be expressed (unless it is paired with its counterpart allele) 3 allele 8. A characteristic or feature of an organism that can be passed from parent to offspring 5 genetics 9. An allele that masks another, and is always expressed in the phenotype
    7. 7. INCOMPLETE DOMINANCE <ul><li>Genes are not always dominant or recessive —in some gene pairs, the genes are neither dominant nor recessive. </li></ul><ul><ul><li>Instead, these genes show incomplete dominance </li></ul></ul><ul><ul><li>Incomplete dominance: </li></ul></ul><ul><ul><li>neither gene in a gene pair masks the other </li></ul></ul><ul><ul><li> The traits carried by the 2 genes are blended </li></ul></ul>
    8. 8. INCOMPLETE DOMINANCE Neither the red gene (R) nor the white gene (W) is dominant. When the 2 genes are present in the same plant, a pink flower results. Both R and W are used (capital letters) because neither the red gene nor the white gene is dominant over the other. White Red
    9. 9. GENETIC PRINCIPLES <ul><li>1) Traits are passed on from one generation of organisms to the next generation. </li></ul><ul><li>2) The traits of an organism are controlled by genes. </li></ul><ul><li>3) Organisms inherit genes in pairs, one gene from each parent. </li></ul>Parent generation (P1) 1 st filial generation (F1) 2 nd filial generation (F2)
    10. 10. GENETIC PRINCIPLES <ul><li>4) Some genes are dominant , whereas other genes are recessive. </li></ul><ul><li>T > t </li></ul><ul><li>5) Dominant genes hide recessive genes when both are inherited by an organism. </li></ul><ul><li>6) Some genes are neither dominant nor recessive . These genes show incomplete dominance. </li></ul>
    11. 11. PROBABILITY <ul><li>What is probability ? </li></ul><ul><li>The possibility, or likelihood, that a particular event will take place. </li></ul><ul><li>Example: </li></ul><ul><li>If you toss a coin, what are the chances that the </li></ul><ul><li>coin will land heads up ? </li></ul><ul><li>50% (either heads or tails) </li></ul><ul><li>The results of one event do not affect the results of the next. </li></ul><ul><li> Previous events do not affect future outcomes </li></ul>
    12. 12. PROBABILITY F1 cross (Bb x Bb) What percentage of offspring are purebred purple ? 25% (1/4) What percentage of offspring are hybrid purple ? 50% (2/4) What percentage of offspring are purebred white ? 25% (1/4)
    13. 13. PROBABILITY F1 cross (Bb x Bb) What percentage of offspring have the same genotype as the parents? 50% (2/4) What percentage of offspring have the same phenotype as the parents? 75% (3/4)
    14. 14. ACTIVITY! <ul><li>Paint your paper maché eggs and sperm! </li></ul>
    15. 15. INSTRUCTIONS <ul><li>1) Find your pair’s egg or sperm. </li></ul><ul><li>2) Put newspaper down on your lab bench. </li></ul><ul><li>3) Paint your egg or sperm— get creative! </li></ul><ul><li>4) Place your painted egg or sperm on top of newspaper on the back table dry. </li></ul><ul><li>I will hang the eggs and sperm in the classroom when they are dry! </li></ul>
    16. 16. GREGOR MENDEL’S PUNNETT SQUARES <ul><li>http://www.youtube.com/watch?v=d4izVAkhMPQ&feature=player_embedded </li></ul>
    17. 17. HOMEWORK FOR NEXT CLASS: <ul><li>Take a break! </li></ul><ul><li>No homework over Spring Break!  </li></ul>
    18. 18. WORKS CITED <ul><li>Images taken from the following sources: </li></ul><ul><li>http://elleseconomy.com/ </li></ul><ul><li>http://mcclungsworld.com/2009/09/24/plants-squares-and-stuff/ </li></ul><ul><li>http://www.life123.com/parenting/education/probability-statistics/probability-problems.shtml </li></ul><ul><li>http://smabiology.blogspot.com/2008_11_01_archive.html </li></ul><ul><li>http://www.graphicshunt.com/health/images/chromosome-885.htm </li></ul>

    ×