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

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Co-dominanceCo-dominance Alleles:

R = Red W= White R1R2 x W1W2 = RW

Alleles:R = Red W= White

R1R2 x W1W2 = RW

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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

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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)

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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

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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.

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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?

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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.

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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

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Polygenic traitsPolygenic traits Examples of

polygenic traits: - Height- Eye color

Examples of polygenic traits:

- Height- Eye color QuickTime™ and a

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http://www.athro.com/evo/inherit.html