What is the primary difference between genomic selection (GS) and marker-assisted selection (MAS)?

A) GS uses genome-wide markers; MAS uses specific markers

B) GS is used for breeding; MAS is only for genetic studie

C) MAS uses genome-wide markers; GS uses specific markers

D) GS is only for improving yield

 Answer: A) GS uses genome-wide markers; MAS uses specific markers

Explanation: Genomic selection evaluates effects of many markers across the genome to compute genomic estimated breeding values, while MAS focuses on a few key markers.