1) (3 pts) The following two recessive genes are known for corn: brittle endosperm (b) and glossy leaf (g). Two true-breeding plants with contrasting phenotypes are crossed (both plants are homozygous for both genes). The Fi offspring are all wild type. Then, an F1 plant is test-crossed with a brittle/glossy parent, and the following offspring are obtained: 16 238 wild type glossy brittle glossy, brittle 254 25 (a) Explain your reasoning as to why these data indicate that the two genes are linked. (b) Estimate how far apart (in map units) the genes are on the chromosome. (c) What were the genotypes and phenotypes of the two pure breeding parents that produced the Fı plant?