In a plant, a tall variety was crossed with a dwarf variety. All F1 plants were tall. When F1 × F1 plants were interbred, 9/16 of the F2 were tall and 7/16 were dwarf.
(a) Explain the inheritance of height by indicating the number of gene pairs involved and by designating which genotypes yield tall and which yield dwarf. (Use dashes where appropriate.)
(b) What proportion of the F2 plants will be true breeding if self-fertilized? List these genotypes.
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