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A horticulturalist wants to produce geraniums with specific characteristics. She knows that the trait of red flowers is governed by the allele R (RR and Rr) and the trait of white flowers is governed by the allele r (rr).
A cross of two geraniums yields offspring that are 100% Rr.
Which choice best represents the alleles of the parents?
A. Rr and rr
B. RR and Rr
C. Rr and Rr
D. RR and rr
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D. RR and rr.
Reason: RR × rr gives all gametes R (from RR) and r (from rr), so every offspring is Rr. Other crosses produce mixtures (Rr × rr → 50% Rr/50% rr; RR × Rr → 50% RR/50% Rr; Rr × Rr → 25% RR/50% Rr/25% rr).
Reason: RR × rr gives all gametes R (from RR) and r (from rr), so every offspring is Rr. Other crosses produce mixtures (Rr × rr → 50% Rr/50% rr; RR × Rr → 50% RR/50% Rr; Rr × Rr → 25% RR/50% Rr/25% rr).
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