Assertion (a)  : superumerary chromosomes do not usually have nay effect on the phenotype
Channel: Doubtnut
Date: 2020-04-19

Assertion (a)  : superumerary chromosomes do not usually have nay effect on the phenotype and Hence ,are geneticallyy unnecssery.   Reason( R ) : in  some plants supernumerary chromosomes result in decrased vigour.