ree separate traits of wild flowers in Arizona were studied. The three traits we

Question

ree separate traits of wild flowers in Arizona were studied. The three traits were determined to be encoded by single, independent genes, each having two distinct alleles, with one completely dominant over the other. The petal color is either violet (P) or white (p; the petals are either small and abundant (S) or large and few (s); the flower stamens are either long (L) or short (0). Individual plants with the genotypes listed below are crossed. Use a branched diagram to predict the proportions, genotypes, and corresponding phenotypes of the progeny plants from these crosses. ALL branches should have proportion, genotrype and corresponding phenotype. PLEASE BE SURE TO COMBINE the PROPORTIONS AND GENOTYPES OF INDIVIDUALS WITH LIKE PHENOTYPES (eg, combine PPSSLL and ¼Ppsul as ½PSLJ. b) PPssLL x PpSsll

Explanation / Answer

Ans.

PP- violet

Pp -violet

pp- white

SS- small and abundant petals

Ss-small and abundant petals

ss-large and few petals

LL- long stamens

Ll- long stamens

ll-short stamens

For

a. parent gametes are PpSSLl*ppSsll

gametes for first parent PpSSLl are PSL, PSl, pSL, pSl

gametes for second parent are pSl, psl

Cross is shown below

                             pSl                  psl

PSL                      PpSSLl                                   PpSsLl

PSl                         PpSSll                                     PpSsll

pSL                        ppSSLl                                     ppSsLl

pSl                          ppSSll                                     ppSsll

Phenotypic ratio

2 violet ,small and abundant petals, long filament

2   violet, small and abundant petals, small filament

2 white, small and abundant petals, long filament

2 white, small and abundant petals, small filament

Genotypic ratio

1 PpSSLl                              

1 PpSsLl                  

1 PpSSll                              

1 PpSsll

1 ppSSLl                               

1    ppSsLl

1   ppSSll                                  

   1 ppSsll

b.parent cross is PPssLL* PpSsll

gametes for first parent PsL

gametes for second parent PSl ,Psl, pSl, psl

cross is shown below

                                 PSl                 Psl                    pSl                   psl

PsL                        PPSsLl                   PPssLl                          PpSsLl                          PpssLl

phenotype ratio

2    violet, small and abundant petals, long filament

2 violet , large and few petals, long filament

Genotype ratio

1 PPSsLl                  

1 PPssLl                        

1 PpSsLl                        

1 PpssLl

C. parent cross is ppSsLl*PPssLl

gametes of first parent is pSL, pSl, psL, psl

gametes for second parent are PsL, Psl

cross is shown below

                         pSL                pSl                  psL                       psl

PsL             PpSsLL            PpSsLl                PpssLL            PpssLl

Psl              PpSsLl             PpSsll                 PpssLl              Ppssll

phenotypic ratio

3 violet, small and abundant and long filament

3 violet , large and few petals, long filament

1 violet , small and abundant, small filament

1 violet , large and few petals, small filament

Genotypic ratio

1PpSsLL

2PpSsLl  

1PpssLL  

2 PpssLl  

1 PpSsll   

1 Ppssll

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