9. In Pisum sativum (pea plants), yellow and round seeds are dominant phenotypes. In a cross between two F1 progenies having yellow and round seeds, 54 out of 900 F2 progenies having green, wrinkled seeds. The other seeds were yellow and round, yellow and wrinkled, green and round. These results show that * O A. the F2 phenotypic ratio is 1:1:1:1. O B. 14 of the seeds are green and wrinkled. O C. 56.25% of the seeds are yellow and round. D. the F1 pea plants are heterozygous for one pair of alleles,