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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 25% ​rr​, 50% ​rr​, and 25% ​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