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Genetics and Genomics

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Dihybrid Test Cross: Tiger Lily

GENES-MR978K

In a species of tiger lily plants, flower color is inherited in an incompletely dominant pattern producing phenotypes red (RR), pink (Rr), and white (rr).

A second, independently assorting locus determines flower petal shape, with the allele for ridged petal edge (E) being completely dominant to straight petal edge (e). A plant heterozygous for both loci is crossed with a white, straight edge petal plant.

What is the expected phenotype ratio from this cross?

A

1 pink, ridged: 1 pink, straight: 2 white, straight

B

1 pink, ridged: 1 white, straight

C

1 pink, ridged: 1 pink, straight: 1 white, ridged: 1 white, straight

D

9 pink, ridged: 3 pink, straight: 3 white, ridged: 1 white, straight

E

There is not enough information given to determine the correct response.