Non-Mendellian Traits What happens when its not all dominant ?
-
Upload
kathleen-briggs -
Category
Documents
-
view
215 -
download
0
Transcript of Non-Mendellian Traits What happens when its not all dominant ?
Non-Mendellian TraitsNon-Mendellian Traits
What happens when its not all dominant ?What happens when its not all dominant ?
Co- dominanceCo- dominance C0- Dominance:
Both traits show up equally. SHARED
Example: Roan horse has red AND white hairs
C0- Dominance:
Both traits show up equally. SHARED
Example: Roan horse has red AND white hairs
QuickTime™ and a decompressor
are needed to see this picture.
Co-dominanceCo-dominance Alleles:
R = Red W= White R1R2 x W1W2 = RW
Alleles:R = Red W= White
R1R2 x W1W2 = RW
QuickTime™ and a decompressor
are needed to see this picture.
QuickTime™ and a decompressor
are needed to see this picture.
Incomplete DominanceIncomplete Dominance Neither variation of
the trait shows up instead a BLEND or MIXING of the two variations.
Example: Red + white = Pink
Neither variation of the trait shows up instead a BLEND or MIXING of the two variations.
Example: Red + white = Pink
QuickTime™ and a decompressorare needed to see this picture.
Incomplete DominanceIncomplete Dominance
Alleles: Cw = White CR = Red
CRCR+ CwCw = CwCR
(Red) + (White ) = (Pink)
Alleles: Cw = White CR = Red
CRCR+ CwCw = CwCR
(Red) + (White ) = (Pink)
QuickTime™ and a decompressor
are needed to see this picture.
Sex-Linked Sex-Linked Alleles: XR = Red eyesXr = White
eyes
Y = does not carry an allele
Alleles: XR = Red eyesXr = White
eyes
Y = does not carry an allele
QuickTime™ and a decompressor
are needed to see this picture.
What is the phenotype Male/female? Red or white ?
XR Xr = ____
Xr Y = ___
XR XR = ____
XR Y = ___
Sex-linkedSex-linked Trait is carried on X
chromosome only
Ex. Hemophelia
Females have 2 choices (XX), males only 1 choice (X) - higher number of males who will get the trait.
Trait is carried on X chromosome only
Ex. Hemophelia
Females have 2 choices (XX), males only 1 choice (X) - higher number of males who will get the trait.
QuickTime™ and a decompressor
are needed to see this picture.
Sex-linkedSex-linked What do you see?
In A: _____ In B: _____ In C: _____
In D: _____
How many students in class see what you see?
What do you see?
In A: _____ In B: _____ In C: _____
In D: _____
How many students in class see what you see?
QuickTime™ and a decompressor
are needed to see this picture.
Sex-linkedSex-linked Trait is carried on X
chromosome only
Example: Color blind
Females have 2 choices (XX), males only 1 choice (X) - higher number of males who will get the trait.
Trait is carried on X chromosome only
Example: Color blind
Females have 2 choices (XX), males only 1 choice (X) - higher number of males who will get the trait.
QuickTime™ and a decompressor
are needed to see this picture.
Polygenic traitsPolygenic traits > 3 alleles for a trait
Trait = skin color
Alleles: A = black a= whiteB= black b= whiteC= black c= white
AaBbCc = heterozygous for skin color
> 3 alleles for a trait
Trait = skin color
Alleles: A = black a= whiteB= black b= whiteC= black c= white
AaBbCc = heterozygous for skin color
QuickTime™ and a decompressor
are needed to see this picture.
Polygenic traitsPolygenic traits Examples of
polygenic traits: - Height- Eye color
Examples of polygenic traits:
- Height- Eye color QuickTime™ and a
decompressorare needed to see this picture.
http://www.athro.com/evo/inherit.html