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Multiple Alleles

Multiple Alleles. Multiple Alleles. Remember: Chromosomes occur in pairs . (homologous pairs) the different alleles of a gene occupy the same positions on each chromosome. Multiple Alleles. So far each gene we have discussed has been made of two possible alleles.

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Multiple Alleles

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  1. Multiple Alleles

  2. Multiple Alleles Remember: Chromosomes occur inpairs. (homologous pairs) the different alleles of a gene occupy the same positions on each chromosome

  3. Multiple Alleles So far each gene we have discussed has been made of two possible alleles. Ex. B = blue b= yellow R = red r = white

  4. Multiple Alleles However, it is possible to have several different allele possibilities for one gene. Multiple alleles is when there are more than two allele possibilities for a gene.

  5. Multiple Alleles In traits with multiple alleles, each individual can carry any two of the several possible alleles. Ex. BLOOD TYPE The gene for blood type has 3 possible alleles. A, B, or O

  6. Blood Type In this case both A and B are dominant to O (recessive). A and B are codominant (both expressed) So... there are four human blood types AA, AO A blood type BB ,BO B blood type AB AB blood type or OO O blood type

  7. Blood Type

  8. Blood Type Practice Problems: 1. A mother is AB and a father is O. Draw the punnett square. A B O O What is the probability their offspring will have A type blood? Can they have an offspring with O blood?

  9. Blood Type 2. A mother is AO and a father is BB. Draw the punnett square. What is the probability their offspring will have B type blood? Can they have an offspring with O blood?

  10. Blood Type 3. If a child has AB blood which of the following could NOT be the parents? a) OO, AB b) AO, BB c) BB, AA d) AO,BO

  11. Blood Type

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