This is definitely true for autism. It’s clearly somewhat heritable, but no one has found a gene or mutation that all people with autism share. Study A picks ou

This is definitely true for autism. It’s clearly somewhat heritable, but no one has found a gene or mutation that all people with autism share. Study A picks out this gene from one set of families, Study B picks out a totally different gene (and can’t replicate A’s findings). Alzheimer’s is a little odd in that most (maybe all) patients seem to have the plaques. Removing the plaques seems to do nothing though so it might be a side effect of something else going wrong.