Transcription of What about two traits?
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What about two traits?
What about two traits? dihybrid Crosses!Consider two traits for pea: Color: Y (yellow) and y (green) Shape: R (round) and r (wrinkled)!Each dihybrid plant produces 4 gamete types ofequal frequency. YyRr (adult)" four gamete types: YR, Yr, yR or yrDihybrid crosses reveal the law ofindependent assortment A dihybrid is an individual that is heterozygous at twogenes (YyRr) Mendel designed experiments to determine if two genessegregate independently of one another in dihybrids First constructed true breeding lines for both traits (YYRR & yyrr) crossed them to produce dihybrid offspring (YyRr) examined the F2 for parental or recombinant types (newcombinations not present in the parents)Tracking Two Genes Pure-breeding parentals F1 are all RrYy Self or cross F1 Observe 9:3:3:1 ratio Note that the round green andwrinkled yellow phenotypiccombinations observed in theparents did not stay togetherin the of Mendel s dihybrid crosses F2 generation contained both parental types and recombinant types F2 showed 4 different phenotypes: the round and yellow traits did notstay linked to each other.
Dihybrid crosses reveal the law of independent assortment ¥A dihybrid is an individual that is heterozygous at two genes ( YyRr) ¥Mendel designed experiments to determine if two genes segregate independently of one another in dihybrids ÐFirst constructed true breeding lines for both traits (YYRR & yyrr)
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