TLS Online TPP Program

#Question id: 21248


An 11-year-old male was having difficulty reading the graphs that his teacher was showing at the front of classroom. His teacher recommended he be seen by an ophthalmologist. Not only was he asked to look at a Snellen letter chart for visual acuity but he was also asked to identify numbers in an Ishihara chart. He responded that he merely saw a bunch of dots. Abnormal color vision is 20 times more  common in men than women because most cases are caused by an abnormal

#Unit 7. System Physiology – Animal
  1. dominant gene on the Y chromosome.
  2. recessive gene on the Y chromosome.
  3. dominant gene on the X chromosome.
  4. recessive gene on the X chromosome.