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Dominance in Genes

Dominance in Genes. T Y. T y. t Y. t y. T Y. TT YY. TT Yy. T t YY. T t Yy. T y. TT Yy. TT yy. T t Yy. T t yy. t Y. T t YY. T t Yy. tt YY. tt Yy. t y. T t Yy. T t yy. tt Yy. tt yy. Dihybrid Crosses. Cross involving TtYy x TtYy with dominant/recessive traits

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Dominance in Genes

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  1. Dominance in Genes

  2. TY Ty tY ty TY TTYY TTYy TtYY TtYy Ty TTYy TTyy TtYy Ttyy tY TtYY TtYy ttYY ttYy ty TtYy Ttyy ttYy ttyy Dihybrid Crosses • Cross involving TtYy x TtYy with dominant/recessive traits • Phenotypic ratio ~ 9:3:3:1 • Genotypic ratio~ 1:2:1:2:4:2:1:2:1 Tall T Short t Yellow Y Green y

  3. Dominance of genes • Dominant/recessive • One can mask over the other. • Incomplete dominance • Neither masks over the other. Blending occurs • Ex: Snapdragons, mice… • Codominance • Both traits are expressed together.

  4. Codominance

  5. Codominance Crossing a purebred chestnut brown horse with a purebred white horse: HBHB x HWHW

  6. Codominance: Human Blood • Three alleles in the human race control blood type • Type A, has A antigen on the blood cells • Type B, has B antigen on cells • Type O, has no antigen on cells • Antigen: A certain carbohydrate/protein found on a cell’s membrane

  7. Codominance: Human Blood

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