If you draw the chart that crosses which genes each offspring would receive, the answer would be Rr, rr, rr and rr. With that you would say there is a 1 in 4 chance of getting Rr and 3 in 4 chances of getting rr.
When a heterozygous plant (Rr) is crossed with a homozygous recessive plant (rr), the probabilities of the offspring's seed colors are approximately 33.3% for Rr (dominant) and 66.7% for rr (recessive). This result is based on a Punnett square analysis. Thus, the expected ratio is 1:2 for the respective seed colors.
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