title: Analysis of the VIQ scores of families of three or more Orkney brothers.
abstract: Classification of the boys in 48 families of three or more brothers according to their Moray House Test (VIQ) scores awarded at age 11 +/- 1 1/2 years in 1947-75 confirms the postulated existence of a total of nine male phenotypes for this X-linked trait in the score range < 70 to 140 points. The phenotypic means lie close to the sequence 69(8)133. Recombination is shown to occur. An additive effect of three alleles at each of two X-chromosome loci is the most likely simple scheme. An iterative approach matching the observed mixtures of proposed genotypes in the families with probabilities for variable levels of homozygosity, non-crossover/crossover heterozygosity, and maternal meiotic recombination yields a best goodness of fit where this last is 20%.
authors.forename: J D
authors.initials: JD
authors.lastname: Goodman
authors.forename: R B
authors.initials: RB
authors.lastname: Anderton
mesh_terms: D015982:Bias; D002648:Child; D003434:Crossing Over, Genetic; D008040:Genetic Linkage / Q000235:genetics*; D005838:Genotype; D006579:Heterozygote; D006720:Homozygote; D006801:Humans; D007360:Intelligence / Q000235:genetics*; D008297:Male; D005810:Multigene Family / Q000235:genetics; D010641:Phenotype; D011995:Recombination, Genetic / Q000235:genetics; D012606:Scotland; D012727:Sex Characteristics; D014705:Verbal Behavior; D014960:X Chromosome / Q000235:genetics*