Kip studies flower color in petunias, where the allele for red flowers, R, is dominant to the allele for white flowers, r. If Kip makes the cross RR x rr, the gametes that are produced

An RR parent can pass only an R allele in its gametes, while an rr parent can pass only an r allele. Therefore, the gametes from one parent carry R and those from the other carry r. This matches choice C; gametes carry one allele, not both R and r.

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