In imaginary fruit, white fruit color (W) is dominant over yellow fruit color (w) and disk-shaped fruit (D) is dominant over sphere-shaped fruit (d). If a plant true-breeding for white, disk-shaped fruit is crossed with a plant true-breeding for yellow, sphere-shaped fruit, what will the phenotypic ratios be for: Show all work

See the answer below

Explanation:

Genotype of a true-breeding white, disk-shaped fruit = WWDD

Genotype of a true-breeding yellow, sphere-shaped fruit = wwdd

Crossing the two:

   WWDD    x    wwdd

             WwDd

All the offspring (100%) will have the genotype WwDd with white, disk-shaped phenotype.

Assuming the cross is advanced to F2:

  WwDd    x    WwDd

W_D_    9   White, disk-shaped (9/16)

W_dd     3   White, sphere-shaped (3/16)

wwD_     3   Yellow, disk-shaped (3/16)

wwdd      1    Yellow, sphere-shaped (1/16)

(See the attached image for the Punnet's square)

1 and 6 for apex

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