Blue poppies native to China are grown at a plant-breeding center in California, where those with th

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Blue poppies native to China are grown at a plant-breeding center in California, where those with the thickest leaves survive and reproduce best in the drier climate. This evolutionary adaptation of the poppies to their new environment is due to

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Sol.(c) [Key Concept: Directional Selection — One Extreme Favoured] This is directional selection — selection favouring one extreme phenotype (thickest leaves). Under the drier California climate, individuals with thicker leaves (better water conservation) survive and reproduce better. Over generations, the mean leaf thickness shifts toward the favoured extreme, as selection is favouring one extreme.

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