A botanist has a pea plant with an unknown genotype; the pea plant has a green pod colour and round seed shape. Green pod colour (G) and round seed shape (R) are both dominant over yellow pod colour (g) and wrinkled pea shape (r). To determine the genotype of his pea plant, the botanist performs a test cross. a) Show ALL possible combinations that may result from this cross and provide the phenotype ratios for the offspring. (Hint: there is more than one possible result from the test cross. You must show ALL possibilities for full marks.) b) The botanist determines that phenotype ratio of the offspring is 1 round, green: 1 round, yellow. What was the genotype of the botanist's round seed, green pod parent plant?