a culture of e. coli is irradiated with uv light. the highest frequency of mutations would be obtained if after the irradiation, the cells were immediately

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?