For one plant species, the allele for red-coloured fruit is dominant and is shown by the letter $R$. The allele for white-coloured fruit is recessive and is shown by the letter $r$. Two plants that are heterozygous for fruit colour are crossed. Which genotypes could the offspring plants have from this cross?
- A$RR$, $Rr$ and $rr$
- Ball $Rr$
- Call $rr$
- D$Rr$ and $rr$ only