Can anyone list one concept or idea...

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2. Hmm, probably something in the anti-choice area

For example, the notion that the union of two gametes is the moment at which a separate "person" arises that cannotceyhically be killed. Or, in spiritual terms, when a soul is created or enters a physical entity.

Science had a neutral explanation for the continuum of life, with various steps being mere milestones along the way in the propagation of species by means of sexual reproduction.

But the anti-choicers got fixated on the moment of conception, based largely, I think on scientific discoveries regarding dna and its significance, even though science has little to say about any ethical significance of that moment.

Yes, anti-choice was certainly a thing before Watson and crick, but scientific understanding of conception certainly has influenced the views of anti-choicers.