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Summary The theory of the method of z‐scores and corrections is discussed. The reasons for their use are explained, and their theoretical justification. Formulae are given for the cases of X‐linked genes and double backcross autosomal matings. New tables of the scores are also provided.
Summary A large family in which a case of hepatic porphyria of the porphyria variegata type occurred has been defined and traced, and the faecal porphyrins measured for 160 out of 151 of the living members, The limitations of the present tests in discovering latent cases and in determining the...
8. SUMMARY A simple model has been discussed which takes into account variable family sizes. It has been shown that these greatly influence the equilibrium gene and trait frequencies in a population of births, for a lethal recessive autosomal gene.
SUMMARY AND CONCLUSIONS 1. The time interval between a confinement and the initiation of a subsequent pregnancy is called a ‘conception delay’. Under some circumstances, the interval between the two confinements (‘birth interval’) is a useful criterion of conception delay. 2. When data from a...
Summary A, a are alleles at one locus. Considered on their own, other alleles being fixed, they display heterosis, so that there exist unique stable equilibrium values p, q for their respective gene frequencies. Let B, b be a second pair of heterotic genes at a second locus, with equilibrium...
SUMMARY AND CONCLUSIONS 1. Some stillbirth sibships are characterized by positive birth‐order effects, and among them some are probably of the sort illustrated by Fig. 1; other stillbirth sibships are characterized by negative order effects, and among them some are probably of the sort...
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