TABLE 1

Relationship types with corresponding X-linked kinship coefficients

Relationship no. (k)Relationship typeSymbol for relationship classSexes of the pairΦ
1Full-sibst1Male–maleEmbedded Image
2Half-sibs (female parent)t1Male–maleEmbedded Image
3Uncle–nephew (female parent)t2Male–maleEmbedded Image
4Grandfather–grandson (female parent)t1Male–maleEmbedded Image
5Parent–offspringv1Female–femaleEmbedded Image
6Full-sibsv2Female–femaleEmbedded Image
7Half-sibs (male parent)v1Female–femaleEmbedded Image
8Half-sibs (female parent)v3Female–femaleEmbedded Image
9Aunt–niece (male parent)v3Female–femaleEmbedded Image
10Aunt–niece (female parent)v4Female–femaleEmbedded Image
11Grandmother–granddaughter (male parent)v1Female–femaleEmbedded Image
12Grandmother–granddaughter (female parent)v3Female–femaleEmbedded Image
13Parent–offspringu1Male–femaleEmbedded Image
14Full-sibsu2Male–femaleEmbedded Image
15Half-sibs (female parent)u2Male–femaleEmbedded Image
16Uncle–niece (male parent)u2Male–femaleEmbedded Image
17Uncle–niece (female parent)u3Male–femaleEmbedded Image
18Aunt–nephew (female parent)u4Male–femaleEmbedded Image
19Grandfather–granddaughter (female parent)u2Male–femaleEmbedded Image
20Grandmother–grandson (female parent)u2Male–femaleEmbedded Image
  • Relationship types with X-linked kinship coefficient of zero are not shown. These include the male–male relationships of parent–offspring, half-sibs (through male), uncle–nephew (through male), and grandfather–grandson (though male) as well as the male–female relationships of half-sibs (through male), aunt–nephew (through male), grandfather–granddaughter (through male), and grandmother–grandson (through male).