Unlike typical migraines, whereby a heightened genetic susceptibility is conferred by multiple genes, in this particular form, the cause is a specific mutation in a single gene.
--- Does it say that typical migraines may be caused by the mutation of many genes?
It probably does mean that, although it doesn't specifically say that those genes need to mutate to lead to a typical migraine. It just says that in a typical migraine, several genes may contribute to a person's susceptibility to getting migraines.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
It probably does mean that, although it doesn't specifically say that those genes need to mutate to lead to a typical migraine. It just says that in a typical migraine, several genes may contribute to a person's susceptibility to getting migraines.
"Whereby" is a wrong word. The writer meant "where", but even that is non-standard for "in which". He probably sensed the impropriety of "where" and tried dressing it up with a little lawyerly flourish.
Also, there is bad parallelism. The way it reads, typical migraines are a cause. Two ways to correct the problem are
"Unlike in typical mi