In sweet-pea plants, the gene A/a controls flower colour. The dominant allele gives purple flowers and the recessive allele red flowers. A second gene, B/b, controls the shape of the pollen grains. The dominant allele gives elongated grains and the recessive allele spherical grains.

A plant with the genotype AaBb was test-crossed by interbreeding it with a plant with red flowers and spherical pollen grains.

Using a genetic diagram to solve the problem, write the expected genotypes and phenotypes as well as the expected ratio of the offspring from this cross.