Which of the following statements describe how technology and research changed the understanding of genetics? Select all that apply.

New research and technology built on earlier genetic discoveries, refining and adapting them rather than replacing most prior knowledge, so B is correct. Early geneticists could observe inheritance patterns but lacked a clear understanding of DNA’s structure and function, which limited their explanations; this makes D correct. Advances have been substantial, not merely minor, so C is incorrect.

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