On which chromosome of each parent is the gene controlling $\beta$-thalassemia located?

$A$ color-blind man marries a woman with normal vision,whose family has no history of color blindness. What is the probability that their daughter's children (grandsons and granddaughters) will be color-blind?

Mention any two autosomal genetic disorders with their symptoms.

Haemophilia is a:

Pick out the correct statements.
$(1)$ Haemophilia is a sex-linked recessive disease.
$(2)$ Down's syndrome is due to aneuploidy.
$(3)$ Phenylketonuria is an autosomal recessive gene disorder.
$(4)$ Sickle cell anaemia is an $X$-linked recessive gene disorder.

Which one of the following disorders and its characteristic is correctly matched?