The skin of the bright orange south american toad secretes a lethal neurotoxin. assume that the toxin is produced by an enzyme encoded by a gene that has two alleles: t (dominant, wild-type enzyme/toxin) and t (recessive, no enzyme/toxin produced). the neurotoxin is secreted by means of a protein s produced by the wild-type gene s. the recessive allele s does not produce protein s (thus no secretion of the toxin can occur). a toad that cannot manufacture the enzyme/toxin and is heterozygous for the secretion gene is mated with a toad that cannot secrete the toxin and is heterozygous for the enzyme/toxin gene. what fraction of the progeny will be poisonous to the touch, that is, able both to manufacture and to secrete the toxin? use probability to solve the problem.