A tall round seeded plant (TTRR) is crossed with a dwarf wrinkled seeded plant (ttrr). (a) Write the genotype and phenotype of F$_1$ plants. (b) If F$_1$ plants are self-pollinated, write the possible phenotypes in F$_2$.
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Remember: In a dihybrid cross of the type TtRr $\times$ TtRr, the F$_2$ phenotypic ratio is always 9:3:3:1 if the traits assort independently.