Regarding an allelic pair for flower colour in snapdragons, heterozygotes have pink flowers, whereas the two homozygotes have red flowers or white flowers. When plants with red flowers are crossed with plants with white flowers, what proportion of the offspring is expected to have pink flowers?

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This is an example of incomplete dominance, where the heterozygote (RW) expresses a phenotype (pink flowers) that is intermediate between the phenotypes of the two homozygotes (RR for red flowers and WW for white flowers). Crossing red (RR) with white (WW) will produce all RW offspring, which will have pink flowers.

Regarding an Allelic Pair for Flower Colour in Snapdragons, Heterozygotes