A) either homozygous dominant or heterozygous
B) definitely heterozygous
C) definitely homozygous dominant
D) must be homozygous recessive
E) homozygous dominant since he is a male but a female would be heterozygous

A) All the sons of an affected father will be affected with the trait.
B) Half the sons of a mother whose father was affected with the trait will be affected.
C) Half the sons of an affected father will not be affected with the trait and the other half will be infertile.
D) All the daughters of an affected father will be phenotypically normal but half of their own sons will be affected with the trait.
E) The parents of an affected man likely were both phenotypically normal.

A) autosomal recessive only
B) autosomal dominant only
C) X-linked recessive only
D) X-linked dominant only
E) All of these are possible.