In an experimental grain crop, seed weight is controlled by…
In an experimental grain crop, seed weight is controlled by two duplicate genes acting additively (9:6:1). Double homozygous dominant plants (AABB) produce heavy seeds, double homozygous recessive plants (aabb) produce ultra-light seeds, and individuals carrying a dominant allele at only one locus (A_bb or aaB_) produce intermediate-weight seeds. If you cross two dihybrid plants (AaBb x AaBb), how many out of 16 expected offspring will display the intermediate seed weight phenotype?