A botanist has a pea plant with an unknown genotype; the pea plant has a green pod color and round seed shape. Green pod

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A botanist has a pea plant with an unknown genotype; the pea
plant has a green pod color and round seed shape. Green
pod color (G) and round seed shape (R) are both dominant over
yellow pod color (g) and wrinkled pea shape (r). Therefore, the
botanist’s plant must be one of the following four genotypes:
GGRR, GgRR, GGRr, or GgRr.
a) Perform a test cross with all the possible genotypes given in
the question and give the expected phenotype ratios for each cross.
(Hint: make sure you understand what a “test cross”
is.)
b) When the botanist performs a test cross with the unknown pea
plant, he determines that phenotype ratio of the offspring is 1
round, green: 1 wrinkly, green. Based on these findings, what was
the genotype of the botanist’s round seed, green pod parent
plant.