What should be the genotypes of the parent flowers (P generation) if he wants to ensure that all of the flowers in the F1 generation are tall and yellow?

Urgent in guinea pigs, black fur (b) is dominant over white fur (b). cross a heterozygous (hybrid) black guinea pig with a homozygous (purebred) white guinea pig. complete a punnett square, identify the genotype(s), phenotype(s), and probability (% and fraction) that the offspring will be black and white?