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 heterozygous squash plant is crossed with another heterozygous squash plant what will be the genotypic and phenotypic ratio?

*Hint: Assume complete dominance

WD Wd wD wd

WD

Wd

wD

wd

WDWD

WdWD wDWD wdWD

WDWd WdWd wDWd wdWd

WDwD WdwD wDwD wdwD

WDwd Wdwd wDwd wdwd

Phenotypic Ratio

9/16 will have white, disk-shaped fruit

3/16 will have white, sphere-shaped fruit

3/16 will have yellow, disk-shaped fruit

1/16 will have yellow, sphere-shaped fruit

…so the phenotypic ratio would be:

9:3:3:1

Genotypic Ratio

1/16 WWDD2/16 WWDd2/16 WwDD1/16 WWdd4/16 WwDd2/16 Wwdd1/16 wwDD2/16 wwDd1/16 wwdd

…so the genotypic ratio would be:

1:2:2:1:4:2:1:2:1