Cliff has colorblindness and icthyosis, which causes scaly skin. both traits are x-linked recessive. the probability that he transmits both traits to his sons is

The probability of transmitting both traits to his son is Zero. This is because the son has one X chromosome and one Y chromosome (XX), therefore since the traits are linked to the X chromosomes, it means the son will only be a carrier but will not show the trait phenotypically.