Question: You discover a certain species of weed growing in soil contaminated with toxic PCBs, and later de…

You discover a certain species of weed growing in soil
contaminated with toxic PCBs, and later determine that the PCB
resistance is due to a single dominant allele. a. If 45% of the
seeds from a randomly mating population of resistant weeds will
germinate in contaminated soil, what is the frequency of the
PCB-resistance allele? b. Among all the plants that germinate, what
proportion will be heterozygous? c. What proportion will be
homozygous dominant?