I think its interesting that in the "rationalist" latter half of the 20th century Freud began to be dismissed at least in part on account of his elective affinity with Lamarck; now, it is clear that certain environmental and social factors have an influence on offspring at the genomic level from both parents.

I see you being downvoted, but it's a good quip.

Lamarckian vs. Mendelian genetics was about heritable traits being acquired in life (Lamarck), or being discrete units passed down at conception (Mendel).

Genetics is almost entirely Mendelian, but some of epigenetics is durable and thus Lamarckian.

There's also retroviral integrations, transposons, and all sorts of other complexities that don't fit neatly into boxes.