Final answer:
The genotype of the green progeny from the cross of two green corn plants is AA and Aa, with 'A' representing the dominant allele responsible for the green phenotype. The correct option is B.
Step-by-step explanation:
Two green corn plants produce offspring with a ratio of 2/3 green to 1/3 white, indicating that green corn plants are likely heterozygous.
When two heterozygous parents are crossed (Aa x Aa), the Punnett square predicts offspring genotypes in a 3:1 ratio (3 being the dominant phenotype, green, and 1 being the recessive phenotype, white).
The genotypes for the green progeny in this case would be AA and Aa, as both can produce a green phenotype when A is dominant over A.