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INCOMPLETE DOMINANCEPresented To: Sir Khalid HussainPresented by :09040606-031
Mendel’s Principles•   Inheritance of biological characteristics is    determined by individual units known as    genes.• ...
What is Incomplete Dominance? Incomplete   dominance is a type of  inheritance in which one allele for  a specific trait ...
Example………………..• In Four O’ Clocks, if you cross a  red RR  (which is always pure) with a  white WW (that is also always  ...
Incomplete Dominance
Red   Pink   white
Incomplete Dominance• In incomplete dominance, neither allele  is dominant so there is a blending of  traits when two diff...
Incomplete Dominance• In another flower, if red RR and blue  BB flowers are crossed, they produce a  3rd purple RB flower•...
Incomplete Dominance• Cross of two purple  flowers  RB X RB                      R        B• genotype ratio               ...
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Incomplete dominance

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Incomplete dominance

  1. 1. INCOMPLETE DOMINANCEPresented To: Sir Khalid HussainPresented by :09040606-031
  2. 2. Mendel’s Principles• Inheritance of biological characteristics is determined by individual units known as genes.• During sexual reproduction, genes are passed from parents to offspring.• Two or more forms of the gene for a single trait exist, some forms of the gene may be dominant and others may be recessive.
  3. 3. What is Incomplete Dominance? Incomplete dominance is a type of inheritance in which one allele for a specific trait is not completely dominant over the other allele. This results in a combined phenotype (expressed physical trait).
  4. 4. Example………………..• In Four O’ Clocks, if you cross a red RR (which is always pure) with a white WW (that is also always pure) , you get a pink RW (which is always hybrid /heterozygous)
  5. 5. Incomplete Dominance
  6. 6. Red Pink white
  7. 7. Incomplete Dominance• In incomplete dominance, neither allele is dominant so there is a blending of traits when two different alleles for the same trait occur together.• Colors blend together heterozygous individuals = 3rd phenotype
  8. 8. Incomplete Dominance• In another flower, if red RR and blue BB flowers are crossed, they produce a 3rd purple RB flower• What would be the genotype ratio and phenotype ratio if you crossed two purple flowers?
  9. 9. Incomplete Dominance• Cross of two purple flowers RB X RB R B• genotype ratio RR RB 1RR : 2RB : 1BB R red purple• phenotype ratio 1red : 2 purple : 1 blue B RB BB purple blue

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