The correct option is C 1:4:6:4:1
In a polygenic crosses, the proportion of dominant or recessive homozygous
individuals in the second generation, with the parent
genotype, is equal to 1/Total. However, if the formation of the trait is controlled a single gene, the proportion of homozygotes individuals =
1/4, if two polygenes, the proportion = 1/16 if the three polygenes, the
proportion = 1/64.
Hence in this case, parental genotypes for crosses between the white and red will be -
"aabbcc" for white, and "AABBcc" or "aaBBCC" or "AAbbCC" for a
light-red. All first-generation offspring will be light-red wheat (for
example "AaBbcc"). As a result of crossing first-generation hybrids, we
obtain the inheritance of the traits in the phenotypic ratio of 1:4:6:4:1.