Non-Mendellian Traits What happens when its not all dominant ?

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Presentation transcript:

Non-Mendellian Traits What happens when its not all dominant ?

Co- 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

Co-dominance / Alleles: R = Red W= White / R 1 R 2 x W 1 W 2 = RW / Alleles: R = Red W= White / R 1 R 2 x W 1 W 2 = RW

Incomplete 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

Incomplete Dominance / Alleles: C w = White C R = Red / C R C R+ C w C w = C w C R / (Red) + (White ) = (Pink) / Alleles: C w = White C R = Red / C R C R+ C w C w = C w C R / (Red) + (White ) = (Pink)

Sex-Linked / Alleles: X R = Red eyes X r = White eyes Y = does not carry an allele / Alleles: X R = Red eyes X r = White eyes Y = does not carry an allele What is the phenotype Male/female? Red or white ? X R X r = ____ X r Y = ___ X R X R = ____ X R Y = ___

Sex-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.

Sex-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?

Sex-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.

Polygenic traits / > 3 alleles for a trait Trait = skin color Alleles: A = black a= white B= black b= white C= black c= white AaBbCc = heterozygous for skin color / > 3 alleles for a trait Trait = skin color Alleles: A = black a= white B= black b= white C= black c= white AaBbCc = heterozygous for skin color

Polygenic traits / Examples of polygenic traits: - Height - Eye color / Examples of polygenic traits: - Height - Eye color