Question

A wild-type trihybrid soybean plant Phenotype Number is crossed to a pure-breeding Pale 648 soybean plant with the recessive Pale, oval phenotypes pale leaf (), oval seed Pale, short 10 (r), and short height (t). The results Pale, oval, short 102 of the three-point test cross are Oval shown in the table. Traits not listed Oval, short 618 are wild-type. Short 84 Wild type 98 1. True False The phenotypes 1630 listed in the table represent the trihybrid's progeny 2. True False Given the cross design the table reflects the trihybrid's gamete genotypes and frequencies/count 3. If each of the genes considered were on different chromosome types, how many possible phenotypes would this cross produce? 4. If the genes considered are not linked at all, how many possible phenotypes would this cross produce? __ 5. If the genes considered are not linked at all, at what proportion would wild-type (for all 3 traits) progeny be observed? 6. If the genes considered are not linked at all, at what proportion would the wild-type (for all 3 traits) gamete in the trihybrid be observed? 7. True / False If the genes considered are all incompletely linked, the number of phenotypes produced by this cross would be less than calculated under the no linkage model.

please solve qs12-23 and include explanations thanks

Answer 1

X pale, oval, shost. Parents.: . os recessive ll rett q wild type Le Rrit i I RI . Į r t cas). Actual order c l T R ch genes / cc Scanned with CamScalnet te

genes odoh are ones with tt The one at the parental genotype, the maximum numbers a Pale (648) and oral shoot (618) ORI Я Е The one with the least members are the ones double over events t Pale short (10) and oral (6) ert LRT ert The one balle atlete altered with respect to the parental allele combinations is the gene for plant height (t) " It lies betwee the gene for pale leaf (2) and seed shape (r) - The order of genes is as follows & ents Distance between leta 1. recombination between them single cross ed overscscat Double soss .. EDCA) SE (102+98) + 10+6)) x.MD 13:25 M 16301 Distance between t 2 2 764 484) +(1016)) fort 0.00M . lt Scanner Cams 13:25 CM 10.06M

e TR somatic cell It Posible pourtaguneti a T.R) and (Lite) a wild type te (B). Possible parental or gametes genotypes ATD (lte (16) Possible & parental phenotype : . T o possible of parental phenotype: 13 No. of esopected double cross overs. = (% recombination eye ={(13.25) (10.06) 1630 Llioo cino) = 21.73 9 The number of observed double cross ovess = 10+6 = 16 1 0 wefficient of coincidence = observed double cross overs - expected double cross overs = 16 0 % expected crossovers that were observed = 164+10+102+6+84 498) = 22.33% -20 del Interferences 1- coefficient of coincidence = 1-0-74 20.26 63. expected crossovers that were not observed. = (0.26) (100) 2172 = 0.74 10D 1630 = 26% Scanned with CamScanner