In summer squash, 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 squash plant true-breeding for white, disk-shaped fruit is crossed with a plant truebreeding for yellow, sphere-shaped fruit, what will the phenotypic and genotypic ratios be for the F1 generation and the F2 generation? ​

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​Please find below the solution to the asked query  
   

If white fruit color (W) is dominant over yellow fruit colour (w) and disk-shaped fruit (D) is dominant over sphere-shaped fruit (d), the cross would be as follows:

Parents:    WWDD                           x                  wwdd​
             (white, disk-shaped fruit)            (yellow, sphere-shaped fruit)

Gametes: WD, wd

F1 generation: ​WwDd (white, disk shaped fruits)
  WD WD
wd WwDd WwDd
wd WwDd WwDd

Gametes: WD, Wd, wD, wd

F2 generation: 
  WD Wd wD wd

WD
WWDD WWDd WwDD WwDd

Wd
WWDd WWdd WwDd Wwdd

wD
WwDD WwDd wwDD wwDd

wd
WwDd Wwdd wwDd wwdd

Phenotypic ratio: 9 (white, disk-shaped fruits): 3 (white, sphere-shaped fruits): 3 (yellow, disk-shaped fruits):1 (yellow, sphere-shaped fruit) ​
Genotypic ratio -1: 2:1: 2:4: 2:1:2:1

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