Variations on Mendel 1. INCOMPLETE DOMINANCE Neither trait is completely dominant over the other Get...
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![Page 1: Variations on Mendel 1. INCOMPLETE DOMINANCE Neither trait is completely dominant over the other Get a BLEND of the two traits The new phenotype is somewhere.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f1e5503460f94c355d2/html5/thumbnails/1.jpg)
Variations on Mendel
![Page 2: Variations on Mendel 1. INCOMPLETE DOMINANCE Neither trait is completely dominant over the other Get a BLEND of the two traits The new phenotype is somewhere.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f1e5503460f94c355d2/html5/thumbnails/2.jpg)
1. INCOMPLETE DOMINANCE• Neither trait is completely
dominant over the other• Get a BLEND of the two traits• The new phenotype is
somewhere between the original two
![Page 3: Variations on Mendel 1. INCOMPLETE DOMINANCE Neither trait is completely dominant over the other Get a BLEND of the two traits The new phenotype is somewhere.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f1e5503460f94c355d2/html5/thumbnails/3.jpg)
• IW = white IR = Red
• White Carnation x Red Carnation
• Parent Genotypes?
–IWIW x IRIR
–Do the Punnett Square
• What do you get????
![Page 4: Variations on Mendel 1. INCOMPLETE DOMINANCE Neither trait is completely dominant over the other Get a BLEND of the two traits The new phenotype is somewhere.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f1e5503460f94c355d2/html5/thumbnails/4.jpg)
IW IW
IR
IR
IW IR IW IR
IW IR IW IR
IWIR = 4 / 4 are pink carnations
![Page 5: Variations on Mendel 1. INCOMPLETE DOMINANCE Neither trait is completely dominant over the other Get a BLEND of the two traits The new phenotype is somewhere.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f1e5503460f94c355d2/html5/thumbnails/5.jpg)
•What happens if you cross 2
Pink Carnations?
–IWIR x IWIR
–Do the Punnett Square
–What phenotypes occur?
![Page 6: Variations on Mendel 1. INCOMPLETE DOMINANCE Neither trait is completely dominant over the other Get a BLEND of the two traits The new phenotype is somewhere.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f1e5503460f94c355d2/html5/thumbnails/6.jpg)
IW IR
IW
IR
IW IW IW IR
IW IR IR IR
IWIW = 1 / 4 white
IWIR = 2 / 4 pink
IRIR = 1 / 4 red
![Page 7: Variations on Mendel 1. INCOMPLETE DOMINANCE Neither trait is completely dominant over the other Get a BLEND of the two traits The new phenotype is somewhere.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f1e5503460f94c355d2/html5/thumbnails/7.jpg)
Another Incomplete Dominance example…..
• White bunny x brown bunny = ??
• IWIW x IBIB = IWIB
• IWIB = tan IWIB IWIB
IWIB IWIB
IW IW
IB
IB
![Page 8: Variations on Mendel 1. INCOMPLETE DOMINANCE Neither trait is completely dominant over the other Get a BLEND of the two traits The new phenotype is somewhere.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f1e5503460f94c355d2/html5/thumbnails/8.jpg)
2. CODOMINANCE
• Two traits are dominant at the same time
• Both traits are fully expressed at the same time
![Page 9: Variations on Mendel 1. INCOMPLETE DOMINANCE Neither trait is completely dominant over the other Get a BLEND of the two traits The new phenotype is somewhere.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f1e5503460f94c355d2/html5/thumbnails/9.jpg)
• EX: Speckled Chickens•These birds have BOTH black and white feathers
•Both black and white are dominant
![Page 10: Variations on Mendel 1. INCOMPLETE DOMINANCE Neither trait is completely dominant over the other Get a BLEND of the two traits The new phenotype is somewhere.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f1e5503460f94c355d2/html5/thumbnails/10.jpg)
• IBIB = black feathers• IWIW = white feathers• IBIW = speckled
• Cross a black with a speckled--what are possible phenotypes?
![Page 11: Variations on Mendel 1. INCOMPLETE DOMINANCE Neither trait is completely dominant over the other Get a BLEND of the two traits The new phenotype is somewhere.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f1e5503460f94c355d2/html5/thumbnails/11.jpg)
IB IB
IB
IW
IB IB IB IB
IB IW IB IW
IBIB = 2 / 4 black
IBIW = 2 / 4 speckled
![Page 12: Variations on Mendel 1. INCOMPLETE DOMINANCE Neither trait is completely dominant over the other Get a BLEND of the two traits The new phenotype is somewhere.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f1e5503460f94c355d2/html5/thumbnails/12.jpg)
• Blood Type: based on 2 gene groups
(1)ABO: --Two dominant ( IA and IB )--One recessive ( i )
– IA IB makes ______ – IA i or IA IA makes ______– IB i or IB IB makes _______– i i makes _______
![Page 13: Variations on Mendel 1. INCOMPLETE DOMINANCE Neither trait is completely dominant over the other Get a BLEND of the two traits The new phenotype is somewhere.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f1e5503460f94c355d2/html5/thumbnails/13.jpg)
• Can a Type A and a Type B have:–Type AB child?
•Yes–Type A child?
•Yes..if Type B parent is IB i–Type B child?
•Yes…. if Type A parent is IA i–Type O child?
•Yes…if both are heterozygous
![Page 14: Variations on Mendel 1. INCOMPLETE DOMINANCE Neither trait is completely dominant over the other Get a BLEND of the two traits The new phenotype is somewhere.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f1e5503460f94c355d2/html5/thumbnails/14.jpg)
• Blood Type: based on 2 groups of genes
(2) Rh Factor: -- One dominant gene (I+)
-- One recessive gene (I-)
IA i I+ I- makes _________IB i I+ I- makes __________i i I- I- makes __________
![Page 15: Variations on Mendel 1. INCOMPLETE DOMINANCE Neither trait is completely dominant over the other Get a BLEND of the two traits The new phenotype is somewhere.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f1e5503460f94c355d2/html5/thumbnails/15.jpg)
5. Sex-Linked Genes• X & Y = sex chromosomes• X X = female genotype• X Y: male genotype• “X” –carries traits
–Colorblindness, hemophilia
• “Y” --no corresponding traits• Males are more likely to have these recessive traits than females
![Page 16: Variations on Mendel 1. INCOMPLETE DOMINANCE Neither trait is completely dominant over the other Get a BLEND of the two traits The new phenotype is somewhere.](https://reader036.fdocuments.us/reader036/viewer/2022081603/56649f1e5503460f94c355d2/html5/thumbnails/16.jpg)
5. Sex-Linked Genes• XB = normal sight• Xb = colorblindColorblind Female = Xb Xb
Normal Female= XB XB or XB Xb
Colorblind Male= Xb YNormal Male = XB Y