Mendelian disorders may be of which type?

Absence of teeth,bifid tongue and mental retardness are observed in . . . . . . .

Haemophilia is a type of genetic disorder that is:

The most common type of haemophilia results from the congenital absence of

If all the sons are haemophilic and all the daughters are normal when a haemophilic father mates with a normal mother,this character is:

Assertion $(A) :$ Phenylketonuria is an inborn error of metabolism and inherited as the autosomal dominant trait.
Reason $(R) :$ The disease is caused by mutation in the gene that codes for the enzyme phenylalanine hydroxylase.