$ When the total number of chromosomes is not the exact multiple of the haploid number of an organisms, the phenomenon is called euploidy.
! Euploidy can be Nullisomic also.
A. If both As and R are correct and R is correct explanation of As
B. If both As and R are correct but R is not correct explanation of As
C. If As is correct, R is wrong
D. If both As and R are wrong.