71Problemsa.What is the most likely mode of inheritance ofeach of these phenotypes? Explain.b.List the genotypes of all members in generationIII as far as possible.c.If a hypothetical mating took place between IV-1and IV-5, what is the probability of the Frst child’sbeing a dwarf with cataracts? A phenotypically nor-mal child?(Problem 49 after J. Kuspira and R. Bhambhani,Compendiumof Problems in Genetics.Copyright 1994 by Wm. C. Brown.)50.A corn geneticist has three pure lines of geno-typesa/a;B/B;C/C,A/A;b/b;C/C,andA/A;B/B;c/c. All the phenotypes determined bya,b, and cwill increase the market value of thecorn, so naturally he wants to combine them all inone pure line of genotype a/a;b/b;c/c.a.Outline an effective crossing program that can beused to obtain the a/a;b/b;c/cpure line.At each stage, state exactly which phenotypeswill be selected and give their expected frequencies.c.Is there more than one way to obtain the desiredgenotype? Which is the best way?
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