In corn, blue kernels are produced by a dominant allele of a coloration gene, and white kernels are produced in individuals homozygous for a recessive allele of the samecoloration gene. another gene has two alleles for shape, with smooth kernels being dominant to wrinkled. a plant heterozygous for both genes is testcrossed (crossed to a homozygous recessive white, wrinkled strain). the testcross offspring consist of the following types: 1,447 blue smooth; 1,436 white wrinkled; 150 blue wrinkled; 145 yellow smooth. explain the inheritance of the coloration and shape traits.