Correct option is D
EXPLANATION-
Statement A:
"Codominant molecular markers (i) ______ be used for identification of heterozygotes."
Codominant markers (e.g., SSRs, SNPs) allow differentiation between homozygous and heterozygous genotypes.
(i) = can
Statement B:
"Genome wide association studies (GWAS) (ii) ______ be performed on germplasm with high genetic diversity."
GWAS relies on linkage disequilibrium patterns, which are more informative in diverse germplasm.
(ii) = can
Statement C:
"An F2 mapping population (iii) ______ be used as an immortal population for genetic mapping studies in plants."
F2 populations are not immortal; they are temporary and must be regenerated or maintained.
(iii) = cannot
Statement D:
"Bulk segregant analysis (BSA) (iv) ______ be used for mapping of monogenic qualitative traits."
BSA is commonly used for mapping monogenic traits, especially qualitative ones.
(iv) = can
So, the correct option is (d) - (i) can (ii) can (iii) cannot (iv) can

