Which of the following statements about genes responsible for X-linked disease inheritance is/are TRUE?
1: They are located on the X chromosome.
2: They are passed on from mother to female child only.
3: They are passed to all male offspring from the male parents.
4: They are passed to all male offspring from the affected mother.
1
only 1
2
only 1 and 4
3
only 2, 3 and 4
4
only 1, 2 and 3