Transgenic crop traits — which of the following is NOT a characteristic introduced via genetic engineering? Select the option that does not represent a typical, documented trait of genetically modified (GM) crops.

Introduction / Context:
Transgenic crops (also called genetically modified crops) are engineered to express specific traits that improve agronomic performance, product quality, or nutritional value. Common examples include herbicide tolerance, insect resistance, and enhanced nutritional profiles.

Given Data / Assumptions:

• The listed traits include herbicide resistance, Bt toxin expression, and higher methionine content.
• Question asks for which option is NOT a characteristic of transgenic crops.
• We assume mainstream, peer-reviewed or commercially used traits.

Concept / Approach:

Herbicide-resistant and Bt crops are widely deployed. Nutritional enhancement, including elevated essential amino acids (e.g., methionine, lysine) has been demonstrated in research and some products. Therefore, all provided traits are valid examples of transgenic outcomes.

Step-by-Step Solution:

Verification / Alternative check:

Commercial portfolios and research literature confirm these categories: HT (herbicide tolerant), Bt (insect resistant), and biofortified crops (amino acids, vitamins) are well established.

Why Other Options Are Wrong:

Herbicide resistance is a classic GM trait. Bt expression is a hallmark of GM insect control. Increasing methionine has been a goal in oilseeds and cereals via transgenes encoding sulfur-rich storage proteins.

Common Pitfalls:

Assuming nutrition traits are not “transgenic” because they are less common commercially; many are proven in development pipelines.

Final Answer:

None of these