YR Yr yR yr 1 4 1 4 1 4 1 4 Dependent Independent YR yr 1 2 1 2 YYRR P Gametes

Yr yr yr yr 1 4 1 4 1 4 1 4 dependent independent yr

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YRYryRyr1 41 41 41 4DependentIndependent YRyr1 21 2
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YYRRPGametesYRyryyrrYyRr12YRYRyr1 21 212yrYYRR YyRryyrrYyRr3 41 4SpermPhenotypic ratio 3:1YR1 4Yr1 4yR1 4yr1 49 163 163 161 16YYRR YYRr YyRRYyRrYyrrYyRrYYrrYYRrYyRR YyRr yyRRyyRryyrryyRrYyrrYyRrPhenotypic ratio 9:3:3:1EggsYRYryRyr1 41 41 41 4SpermF2EggsF131510810132Fig 14.8: Dihybrid F2Results4 phenotype combinations in a 9:3:3:1 ratio:9/16 (dom, dom)3/16 (rec, dom)3/16 (dom, rec)1/16 (rec, rec)Only possible with independent assortment,Hypothesis:DependentAssortmentHypothesis:IndependentAssortment
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Mendel’s ConclusionPossible gametesCrossing-overHomologous chromosomesPossibility 1Metaphase IPossibility 2Metaphase IIDaughtercellsABabAbaBLaw of Independent Assortment: alleles for different gene loci segregate into gametes independentlyResults from meiotic processes:Independent assortment of chromosomesFor genes on different chromosomes (fig 13.11)Crossing overFor genes on the same chromosome (Canvas fig),12YRYRyr1 21 212yrYYRRYyRryyrrYyRr3 41 4SpermYR1 4Yr1 4yR1 4yr1 49 163 163 161 16YYRRYYRrYyRRYyRrYyrrYyRrYYrrYYRrYyRRYyRryyRRyyRryyrryyRrYyrrYyRrEggsYRYryRyr1 41 41 41 4SpermF2EggsF1
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