Which developmental defect occurs when ecdysone signaling prematurely activates throughout a monarch butterfly pupae wing imaginal disc?

💡 Explanation

When ecdysone signaling prematurely activates, inappropriate expression of genes controlling wing vein differentiation occurs because signaling gradients become disrupted before the disc has fully differentiated, leading to altered specification. Therefore disrupted vein patterning results, rather than abnormal coloration, developmental delay, or wing loss which require different hormonal imbalances or mutations.

• Which outcome impairs adult structure development when ecdysone levels inconsistently stimulate imaginal discs?
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