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(B) In a dihybrid cross between $YYRR$ (yellow round) and $yyrr$ (green wrinkled),the $F_1$ generation produces $YyRr$ (yellow round) seeds.When $F_1$

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$12$:$4$

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(B) In a dihybrid cross between $YYRR$ (yellow round) and $yyrr$ (green wrinkled),the $F_1$ generation produces $YyRr$ (yellow round) seeds.When $F_1$ generation plants are self-pollinated,the $F_2$ phenotypic ratio is $9:3:3:1$.- Yellow round = $9$- Yellow wrinkled = $3$- Green round = $3$- Green wrinkled = $1$To find the ratio of yellow to green seeds:- Total yellow seeds = $9 + 3 = 12$- Total green seeds = $3 + 1 = 4$Thus,the ratio of yellow to green seeds in the $F_2$ generation is $12:4$ (which simplifies to $3:1$).

In a cross performed between parents considering two contrasting characters yellow round and green wrinkled seeds. In the $F_2$ generation progeny,the ratio of yellow and green will be . . . . . . .

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