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Dihybrid cross Cross Involving 2 characteristics/ genes
Ex #3: Characteristic Contrasting traits Seed shape R = Round, r = wrinkled Seed color Y = Yellow, y = green Perform an F1 cross: RrYy X RrYy
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Dihybrid cross Ex. Perform a cross between two parents who are heterozygous for both traits: RrYy X RrYy
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Dihybrid cross Perform an F1 cross: R r Y y X R r Y y
(Use FOIL method to find all gametes.) RY
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Dihybrid cross Perform an F1 cross: R r Y y X R r Y y
(Use FOIL method to find all gametes.) Ry RY
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Dihybrid cross Perform an F1 cross: R r Y y X R r Y y
(Use FOIL method to find all gametes.) Ry rY RY
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Dihybrid cross Perform an F1 cross: R r Y y X R r Y y
(Use FOIL method to find all gametes.) Ry rY ry RY
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Dihybrid cross Perform an F1 cross: R r Y y X R r Y y
(Use FOIL method to find all gametes.) Ry rY ry RY RY Ry rY ry
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Dihybrid cross Perform an F1 cross: R r Y y X R r Y y Ry rY ry RY RY
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Dihybrid cross R r Y y X R r Y y Round : Round : wrinkled : wrinkled
Yellow green Yellow green R r Y y X R r Y y Ry rY ry RY RY RRYY RRYy RrYY RrYy Ry RRYy RRyy RrYy Rryy rY RrYY RrYy rrYY rrYy ry RrYy Rryy rrYy rryy
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Dihybrid cross Round : Round : wrinkled : wrinkled
Yellow green Yellow green Ry rY ry RY RY RRYY RRYy RrYY RrYy Ry RRYy RRyy RrYy Rryy rY RrYY RrYy rrYY rrYy ry RrYy Rryy rrYy rryy
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Dihybrid cross Round : Round : wrinkled : wrinkled
Yellow green Yellow green : : : Ry rY ry RY RY RRYY RRYy RrYY RrYy Ry RRYy RRyy RrYy Rryy rY RrYY RrYy rrYY rrYy ry RrYy Rryy rrYy rryy
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Handy Hint: Anytime you perform a dihybrid cross and BOTH parents are heterozygous for BOTH genes, you will ALWAYS get a ratio of: Dominant Dominant Recessive Recessive Dominant recessive Dominant Recessive 9 : 3 : 3 : 1
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