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)
Gametes: WD, Wd, wD, wd
F2 generation:
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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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
Hope this information will clear your doubts about the topic.
If you have any more doubts just ask here on the forum and our experts will try to help you out as soon as possible.