Answer:
Step-by-step explanation:
The genotype of a purebred red flower is RR, and the genotype of a purebred white flower is rr. When these two flowers are crossed, their offspring will have the genotype Rr, because each parent will pass on one copy of their allele (R or r) to their offspring.
The R allele is dominant, so any offspring with at least one R allele will have the phenotype of red. The only way for an offspring to have a white phenotype is for it to have two copies of the recessive r allele (rr). Therefore, all possible phenotypes for the offspring are red.
In a Punnett square, where the alleles of the parents are represented on the top and left sides, and the possible offspring genotypes are represented in the boxes, it would look like this:
R R
r Rr
r Rr
As you can see, all possible genotype of the offspring is Rr and the phenotype is Red.