F13 lecture 2 v2

Eg in a monohybrid cross for the plant height locus dd

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Unformatted text preview: s linkage in a future lecture One of Mendel’s dihybrid crosses YYRR yyrr YYrr yyRR YyRr YyRr YYRR, YYRr, YyRR, YyRr YYrr, Yyrr YyRr yyRR, yyRr yyrr this is a Punnett square for a dihibrid cross parent 1 gamete types parent 2 gamete types YR 25% Yr 25% yR 25% yr 25% YR 25% 1/16 YRYR 1/16 YRYr 1/16 YRyR 1/16 YRyr Yr 25% 1/16 YrYR 1/16 YrYr 1/16 YryR 1/16 Yryr yR 25% 1/16 yRYR 1/16 yRYr 1/16 yRyR 1/16 yRyr yr 25% 1/16 yrYR 1/16 yrYr 1/16 yryR 1/16 yryr parent 1 gamete types YR 25% Yr 25% yR 25% yr 25% 1/16 YYRR 1/16 YYRr 1/16 YyRR 1/16 YyRr Yr 25% 1/16 YYRr 1/16 YYrr 1/16 YyRr 1/16 Yyrr yR 25% 1/16 YyRR 1/16 YyRr 1/16 yyRR 1/16 yyRr yr 25% parent 2 gamete types YR 25% 1/16 YyRr 1/16 Yyrr 1/16 yyRr 1/16 yyrr where do the ratios come from? count up the squares you can also calculate the ra5os this way a trihybrid cross (#s are phenotype frequencies) In class exercise 2 •  In the following trihybrid cross: –  grandparent 1: DDYY...
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