How many of these statements are true for polymorphism
(A)it is inheritable
(B)it arises due to mutation
(C)it varies at genetic level
(D)it is the basis of genetic mapping
(E)it is important for evolution and speciation
(F)It varies from single nucleotide to large scale
solution- Refer NCERT ,heading 6.10, page-121and 122, para 2,3, 4 and para 1 respectively.