incomplete & codominance genetics biology 30 mrs. s. pipke-painchaud

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  • Slide 1
  • Incomplete & Codominance Genetics Biology 30 Mrs. S. Pipke-Painchaud
  • Slide 2
  • Reviewing All photos from:
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  • Incomplete Dominance (a.k.a. partial dominance or blending) occurs when both alleles contribute to a trait that is not like either parent. this condition is only seen in the heterozygous individual ex.. Snap Dragons or Four OClocks or Morning Glory or Primrose (Flowers) Curly (homozygous) or straight (homozygous), but if you are heterozygous you have wavy hair.
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  • Example: Snap Dragons Parents: Red X White W = red w = white Parents are both true breeding red and white. WW X ww Genotype: All Ww Phenotype: All Pink WW wWw w snapdragon.jpg
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  • F1 x F1 Cross Ww X Ww Remember: W = red w = white Ww = pink Genotypic Ratio: 1WW: 2 Ww: 1ww Phenotypic ratio: 1 Red: 2 Pink: 1 White Ww WWWWw w ww ***NOTE: Because there is no dominance in the heterozygote the phenotypic ratio is identical to the genotypic ratio**** http://www.visionle modules/mid129/Im age/VLObject- 3228- 050216120240.jpg
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  • 005/biol110/tutorials/tutorial5_f iles/figure_14_9.gif 005/biol110/tutorials/tutorial5_f iles/figure_14_9.gif 5/media/flowers.gif
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  • How the coloring works... WW have enough pigment to be red ww - flowers dont have any pigment = no color Ww only have enough pigment to be pink
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  • Codominance the two dominant genes are expressed at the same time both traits appear in the heterozygous individual at the same time ex.. Roan (Red or Blue) coat color in horses and cattle Chestnut and White color in horses are both dominant traits; the heterozygous individual is a palomino (golden).
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  • Red Roan Example: enetics/exCodominance.jpg enetics/exCodominance.jpg Blue Roan Example: /DSC_0040-803x536.jpg /DSC_0040-803x536.jpg
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  • Coat Color in Horses C= Color gene C R C R = Red C W C W = White C R C W = Red Roan If you cross a true breeding Red horse with a true breeding white horse, what ratios will you get? Genotypic Ratio: All C R C W Phenotypic Ratio: All Red Roan CRCR CRCR CWCW C R C W CWCW
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  • Example: MN Blood Group MN blood group is characterized by a certain type of glycoprotein on the surface of the RBCs. There are two forms: M and N Designate is L L M L M = M L N L N = N L M L N = MN type
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  • MN Blood Group L M L M = M L N L N = N L M L N = MN type What types of offspring would be produced from a cross of a homozygous M type with an MN type? Parents: L M L M X L M L N Genotypic Ratio: 1 L M L M : 1 L M L N Phenotypic Ratio: 1 M blood type: 1 MN blood type LMLM LMLM LMLM LMLMLMLM LMLMLMLM LNLN LMLNLMLN LMLNLMLN
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  • Resource Sites


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