T/f: in a cross between two strains that are true breeding for purple and white flowers, the f2 phenotypic ratio would be ¼ purple, ¼ white, and ½ lavender if the flower color phenotype exhibits incomplete dominance.

True

Explanation:

True breeding for purple and white means that they are homozygous for that phenotype, for example AA is genotype for purple, while aa is genotype for white. Aa is heterozygous and it represents incomplete dominance phenotype. If we cross true breeding for purple and white:

P: AA x  aa

F1: Aa Aa Aa Aa (all of them are with incomplete dominance color)

F2 (Aa x Aa):  AA Aa Aa aa (1/4  1/2  1/4)

substitution is the answer in this case

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