This seems highly likely, especially as it has been shown that in several systems mutations affecting the same amino acid are extremely near together on the genetic map.
-- Francis Crick
   
Francis Crick   Name:
Francis Crick
Type:
Scientist
Nationality:
English
Birth:
June 8, 1916
Death:
July 28, 2004
https://www.nutquote.com/quote/Francis_Crick