There is a genetic trait called sun sneezing when sufferers from ACHOO syndrome sneeze uncontrollably when exposed to direct sunlight. The allele that causes sun sneezing is dominant over the non-sneezing allele. A sun-sneezing man marries a non-sneezing woman. They have many many children and all are sun sneezers. If they have a 23rd child, what are the chances that it will be a sun-sneezer? How do you know?

Cold case files recently began re-investigating an old murder case. the murder took place in the park; a young man, james, was hit over the head with a brick and killed. police suspected the jealous former boyfriend of james' wife, karen. whoever killed james may have washed their hands in a near-by bird bath as detectives found blood in the bird bath. since the murder took place before dna fingerprinting was available, the suspected killer, ronnie, went free. detectives are now reviewing the blood evidence using dna fingerprinting. based on the dna fingerprints of all possible suspects, who is james' killer?