If the father is unaffected by an X linked recessive disorder then his daughters will be free from X linked recessive disorder

Q. X-linked recessive disorders are passed from mothers to their sons and from fathers to their daughters. If a male expresses a X-linked recessive disorder, then which of the following is true for his parents?
I. His mother is a carrier.
II. His father expresses the same disorder.
III. His mother does not express the disorder.

Q. A male carrying a faulty gene for an X-linked recessive disorder will always be affected.

Q. Pick out the correct statements:
(i) Hemophilia is a sex – linked recessive disease
(ii) Down’s syndrome is due to aneuploidy
(iii) Phenylketonuria is an autosomal recessive gene disorder
(iv) Sickle cell anaemia is an X-linked recessive gene disorder