Plenty is doing.
"Professor Lubs and his colleagues (Child Development 57) studied sixteen families in which the number of cases of dyslexia strongly suggested inheritance, and analysed the chromosomes of the people involved. They concluded that the pattern of occurrence of one third of cases was so strongly linked to what appeared to be an abnormal gene situated on Chromosome 15 that the odds in favour of the abnormality being the prime cause of the condition were overwhelming.... The fact that a single gene can influence and even partially control the development of a complete function such as reading implies that other brain functions may be similarly controlled."
Disclaimer: this quote appears here only to spark discussion. It is not endorsed one way or the other. Make up your own mind. Or just refresh the page for another viewpoint. From a collection assembled by the late Chris Brand.