typically an X linked recessive disorder is denoted by a lower case superscript or first letter of the disorder.
for example, the x-linked recessive hemophilia disorder.
parents: (mother is heterozygous recessive, father doesn't have it)
Xh X + XY
offspring
Xh Y (X-linked rec disorder male)
X Y (normal male)
Xh X (hetero, rec, female)
X X (homo, normal, female)
