Certain types of rabbits… <ul><li>… can either be  brown ,  white , have a  chinchilla pattern , or have a  himalayan patt...
<ul><li>Full color rabbit  – alleles are dominant to all others;  CC, Cc ch , Cc h , or Cc </li></ul><ul><li>Chinchilla ra...
<ul><li>Himalayan   rabbit  – color in certain parts of the body; dominant only to c;  c h c or c h c h </li></ul><ul><li>...
<ul><li>C > c ch  > c h  > c </li></ul><ul><li>Predict the outcome of the following cross: </li></ul><ul><li>A full brown ...
<ul><li>How does this type of inheritance differ from what we’ve done in the past? </li></ul><ul><li>Answer   There are m...
 
 
<ul><li>4 possible phenotypes: A, B, AB  or  O </li></ul><ul><li>6 possible genotypes: A  – type A (I A I A ) </li></ul><u...
 
Practice Problems <ul><li>I A i  x  I A i (A x A) </li></ul><ul><li>I B i  x  ii (B x O) </li></ul><ul><li>I A I A   x  I ...
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Alleles

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Alleles

  1. 1. Certain types of rabbits… <ul><li>… can either be brown , white , have a chinchilla pattern , or have a himalayan pattern </li></ul><ul><li>C causes fully brown coat </li></ul><ul><li>cc causes albino (white) </li></ul><ul><li>c ch causes a chinchilla pattern </li></ul><ul><li>c h causes a Himalayan pattern </li></ul><ul><li>The alleles are arranged in the following pattern  C > c ch > c h > c </li></ul>
  2. 2. <ul><li>Full color rabbit – alleles are dominant to all others; CC, Cc ch , Cc h , or Cc </li></ul><ul><li>Chinchilla rabbit – partial defect in pigmentation </li></ul><ul><li>c ch allele dominant to all other alleles except C; c ch c h , c ch c ch , or c ch c </li></ul>
  3. 3. <ul><li>Himalayan rabbit – color in certain parts of the body; dominant only to c; c h c or c h c h </li></ul><ul><li>Albino rabbit – no color – allele is recessive to all other alleles; cc </li></ul>
  4. 4. <ul><li>C > c ch > c h > c </li></ul><ul><li>Predict the outcome of the following cross: </li></ul><ul><li>A full brown rabbit ( Cc h ) and chinchilla ( c ch c ) patterned rabbit mate…what phenotypes would you predict in the offspring? (…and in what percentages?) </li></ul>
  5. 5. <ul><li>How does this type of inheritance differ from what we’ve done in the past? </li></ul><ul><li>Answer  There are more than two alleles for hair color in rabbits. 1 trait = more than 2 alleles… This type of inheritance is called… </li></ul><ul><li>… Multiple Allele Inheritance (when 3 or more alleles exist for a given trait) </li></ul><ul><li>A rabbit’s coat color is determined by a single gene that has at least 4 different alleles. </li></ul><ul><li>What other traits are controlled by multiple alleles? </li></ul>
  6. 8. <ul><li>4 possible phenotypes: A, B, AB or O </li></ul><ul><li>6 possible genotypes: A – type A (I A I A ) </li></ul><ul><li> type A (I A i) </li></ul><ul><li> B – type B (I B I B ) </li></ul><ul><li> type B (I B i) </li></ul><ul><li> AB – type AB (I A I B ) </li></ul><ul><li> O – type O (ii) </li></ul><ul><li>Every person carries two alleles for blood type (out of a total of three allele options – (I A ), (I B ), (i) </li></ul>
  7. 10. Practice Problems <ul><li>I A i x I A i (A x A) </li></ul><ul><li>I B i x ii (B x O) </li></ul><ul><li>I A I A x I B i (A x B) </li></ul><ul><li>A couple, both of whom have type AB blood, can have children with how many different blood types? What are they? </li></ul>
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