> If illnesses like bipolar disorder or schizophrenia were meaningfully caused by genetic factors, then the Nazi genocide of mentally ill people would have caused a dramatic and lasting reduction in mental illness post-war among the affected population. It didn't.
Citation needed.
The population of Germany alone in 1940 was over 70M people. The Nazi's killed an estimated 230K disabled individuals, including the physically disabled and the mentally ill. That only accounts for 3 tenths of a percent of the population, but ~50% of any population will be diagnosed with a mental illness at some point in their lifetime, so their efforts were astoundingly insufficient from a mathematical perspective.
But whether someone is bipolar or not is not a simple trait like whether their earlobes are connected or whether they can roll their tongue. A massive genome study identified at least 64 regions of the genome that are associated with an increased risk of bipolar disorder. But even if it were a simple trait, there is such thing as recessive traits, so the Nazi's agenda was, of course, totally insane and could never be successful from a genetic perspective.
Schizophrenia tends to run in families, but no single gene is thought to be responsible. Bipolar disorder is the most likely psychiatric disorder to be passed down genetically. If one parent has bipolar disorder, there's a 10% chance that their child will develop the illness.
I read (ok, skimmed) an academic study that attempted to compare post-war populations with different histories, and failed to find evidence of an effect; if anything the reverse.
I dislike your sophistry about 50% of the population being mentally ill, as if the victims were chosen from that portion at random. So, out of spite, I'm not going to search for the study and you are free to believe that it doesn't exist.
Citation needed.
The population of Germany alone in 1940 was over 70M people. The Nazi's killed an estimated 230K disabled individuals, including the physically disabled and the mentally ill. That only accounts for 3 tenths of a percent of the population, but ~50% of any population will be diagnosed with a mental illness at some point in their lifetime, so their efforts were astoundingly insufficient from a mathematical perspective.
But whether someone is bipolar or not is not a simple trait like whether their earlobes are connected or whether they can roll their tongue. A massive genome study identified at least 64 regions of the genome that are associated with an increased risk of bipolar disorder. But even if it were a simple trait, there is such thing as recessive traits, so the Nazi's agenda was, of course, totally insane and could never be successful from a genetic perspective.
Schizophrenia tends to run in families, but no single gene is thought to be responsible. Bipolar disorder is the most likely psychiatric disorder to be passed down genetically. If one parent has bipolar disorder, there's a 10% chance that their child will develop the illness.