An agricultural researcher crosses two tomato plants that are heterozygous for both stem colour (AaAaAa) and leaf shape (DdDdDd).
The offspring from this dihybrid cross are expected to show a phenotypic ratio of 9 purple stem, cut leaf : 3 purple stem, potato leaf : 3 green stem, cut leaf : 1 green stem, potato leaf.
Calculate the expected number of green stem, cut leaf tomato plants in a sample of 1280 offspring.
