we are to think that the fruit flies are homozygous in fruit flies, straight win

Question

we are to think that the fruit flies are homozygous
in fruit flies, straight wings are dominant to curly wings anda black abdomen is dominant to a striped abdomen. If a fruitfly that is true breeding for straight wings and black abdomen ismated to one that has curly wings and a striped abdomen, use aPunnett square to determine the genotypic and phenotypic ratios ofthe F2 generation.
in fruit flies, straight wings are dominant to curly wings anda black abdomen is dominant to a striped abdomen. If a fruitfly that is true breeding for straight wings and black abdomen ismated to one that has curly wings and a striped abdomen, use aPunnett square to determine the genotypic and phenotypic ratios ofthe F2 generation.

Explanation / Answer

S= straight, s=curly, B=black, b=striped. The parentalgeneration will be SSBB and ssbb so the F1 generation will be allSsBb. A cross with 2 F1 parents gives the following punnet square: - SB Sb sB sb SB SSBB SSBb SsBB SsBb Sb SSBb SSbb SsBb Ssbb sB SsBB SsBb ssBB ssBb sb SsBb Ssbb ssBb ssbb The following are the possible genotypes and ratios: 1 SSBB: 2SSBb: 2 SsBB: 4 SsBb: 1 SSbb: 2 Ssbb: 1 ssBB: 2 ssBb: 1ssbb The phenotypic ratio is the standard dihybrid cross ratio: Straight black : Straight striped: Curly Black: Curly Striped 9 : 3 : 3 : 1

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