Launch <ul><li>Mr. McCaffrey is colorblind, as is his father. His mother is color normal, but we don’t know whether she is...
Identify the disease below:
Inheritance of Genes:
What does it mean to be a carrier? <ul><li>A person who is a carrier is heterozygous (Aa).  </li></ul><ul><li>They carry t...
<ul><li>We use Punnett Squares to determine what the probability of being a carrier </li></ul><ul><li>We call this ->  a m...
Dihybrid Crosses <ul><li>Dihybrid crosses let you look at two traits at the same time. </li></ul><ul><li>Sixteen boxes ins...
Mendel’s Law of Segregation <ul><li>According to Mendel’s law, each gamete will only have one version (allele) of each chr...
Mendel’s Law of Independent Assortment <ul><li>According to Mendel’s law, which allele goes into each gamete, is random fo...
Distributive Properties <ul><li>We use distribution to determine the gamete possibilities: </li></ul><ul><li>AaBb </li></u...
Dihybrid Crosses <ul><li>The ratio we use for a dihybrid involves 4 different possibilities </li></ul><ul><li>Dominant for...
AR ar aR Ar ar aR Ar AR Dominant for both traits Dominant for one, recessive for the second Dominant for the second, reces...
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3 2 Dihybrid

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3 2 Dihybrid

  1. 1. Launch <ul><li>Mr. McCaffrey is colorblind, as is his father. His mother is color normal, but we don’t know whether she is a carrier or not. </li></ul><ul><ul><li>A. What is McCaffrey’s genotype </li></ul></ul><ul><ul><li>B. What is the genotype of McCaffrey’s father? </li></ul></ul><ul><ul><li>C. Complete a cross/punnett square to figure out his mother’s genotype </li></ul></ul><ul><ul><li>D. Explain whether or not the fact that his father has the disease is important </li></ul></ul>
  2. 2. Identify the disease below:
  3. 3. Inheritance of Genes:
  4. 4. What does it mean to be a carrier? <ul><li>A person who is a carrier is heterozygous (Aa). </li></ul><ul><li>They carry the gene for the disease (a); BUT they do not have the disease because they are protected by the dominant gene (A). </li></ul>
  5. 5. <ul><li>We use Punnett Squares to determine what the probability of being a carrier </li></ul><ul><li>We call this -> a monohybrid cross </li></ul>A a A a Father Mother aa Aa Aa AA
  6. 6. Dihybrid Crosses <ul><li>Dihybrid crosses let you look at two traits at the same time. </li></ul><ul><li>Sixteen boxes instead of four </li></ul>
  7. 7. Mendel’s Law of Segregation <ul><li>According to Mendel’s law, each gamete will only have one version (allele) of each chromosome </li></ul><ul><li>Essentially all gametes are haploid instead of diploid and each gamete has one version of each chromosome from 1-23 </li></ul>
  8. 8. Mendel’s Law of Independent Assortment <ul><li>According to Mendel’s law, which allele goes into each gamete, is random for each chromosome. </li></ul>
  9. 9. Distributive Properties <ul><li>We use distribution to determine the gamete possibilities: </li></ul><ul><li>AaBb </li></ul><ul><li>Possible gametes: AB, Ab, aB, ab </li></ul><ul><li>What are the possible gametes for </li></ul><ul><li>DdFF? </li></ul>
  10. 10. Dihybrid Crosses <ul><li>The ratio we use for a dihybrid involves 4 different possibilities </li></ul><ul><li>Dominant for both traits (A_B_) </li></ul><ul><li>Dominant for the first trait, but not the second (A_bb) </li></ul><ul><li>Dominant for the second trait but not the first (aaB_) </li></ul><ul><li>Recessive for both traits (aabb) </li></ul>
  11. 11. AR ar aR Ar ar aR Ar AR Dominant for both traits Dominant for one, recessive for the second Dominant for the second, recessive for the first Recessive for both traits aarr aaRr Aarr AaRr aaRr aaRR AaRr AaRR Aarr AaRr AArr AARr AaRr AaRR AARr AARR
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