In a test of agender-selection technique, results consisted of 257 baby girls and 277 baby boys. Based on thisresult, what is the probability of a girl born to a couple using thistechnique? Does it appear that the technique is effective in increasing the likelihood that a baby will be agirl? The probability that a girl will be born using this technique is approximately

Men have XY(or YX) chromosomes and women have XX chromosomes.X-linked recessive genetic diseases(such as juvenileretinoschisis) occur when there is a defective X chromosome that occurs without a paired X chromosome that is not defective. Represent a defective X chromosome with lowercasex, so a child with the xY or Yx pair of chromosomes will have the disease and a child with XX or XY or YX or xX or Xx will not have the disease. Each parent contributes one of the chromosomes to the child. Complete parts a through d below.

a. If a father has the defective x chromosome and the mother has good XXchromosomes, what is the probability that a son will inherit thedisease?