In a certain plant species, the allele for red flowers (r) is dominant to the allele for white flowers (r). what is the phenotype result of a cross between two groups of red-flowered plants, both of have all individuals that are heterozygous for the gene.

a.
1/4 red flowers; 3/4 white flowers

b.
all red flowers; no white flowers

c.
1/4 white flowers; 3/4 red flowers

d.
all white flowers; no red flowers