Showing papers in "Journal of Genetics in 1962"
TL;DR: G~n0genesis in which the spermatozoon does not contr ibute any genetic mater ia l lo:klae, zygote but provides the act ivat ing stimulus for the egg is believed to occur in Mo[lie~zesia formosa.
Abstract: G~n0genesis in which the spermatozoon does not contr ibute any genetic mater ia l lo:klae, zygote but provides the act ivat ing stimulus for the egg is believed to occur reg{darly in the teleost, Mo[lie~zesia formosa (Hubbs, 1955, H u b b s and Hubbs , 1932,. 1946). Wtien m a t e d to males of M. sphezzops, s latipimza or a n u m b e r of otl~er related species, :,, : / . M:fo!.mosa females have been repor ted to produce offspring tha t consisted entirely of females: phenotypical ly indistinguishable f lom their s~/[. formosa parent. When such .:: .y rms were backcrossed for as m a n y as twenty generat ions to males of other species, :~0me of whiqh were strikingly different fl-om M. formosa, no introgression of any of the :%h.ari~cters . ... of the species to which the ma]es belonged was not iceable in the offspring. ,;in all more than 8000 fish were bred and every one was a female closely resembling the 61\"iginal M.formosa progeni tor (Habbs and Hubb% 1945). :::(<: M; formosa females are found abundant ]y in southern Texas where they live sympai r i ;;.~ati? wi th ~/i. latipbma and in the Tamaul ipas region of nor theas te rn Mexico where they ;live sympatr icaUy with 3if. sphelzops (Hubbs and Hubbs , 1932). The general habitus 6tiM formosa is in termedia te between M. sphe~z@s and l~s latipinna, both of which are
73 citations
TL;DR: The direction of the foliar spiral in Cocos nucifera is not determined genetically, and it is unknown whether the direction is determined genetically or not.
Abstract: SummaryThe direction of the foliar spiral inCocos nucifera is not determined genetically.
26 citations
TL;DR: The logical structure of human relationships is discussed, namely Wright’s coefficient of single autosomal relationship, and a simple symbolism for human relationships for relationships involving incest, and those between second cousins.
Abstract: The logical structure of human relationships is discussed. When the relatives are not inbred their genetical implications can be summarized by four coefficients of relationship, namely Wright’s coefficient of single autosomal relationship, a coefficient of double autosomal relationship, a coefficient of single sex-linked relationship, and one of double sex-linked relationship between women only. A simple symbolism for human relationships is developed. There are 516 possible relationships betweenA andB, not involving an ancestor of either more remote than a grandparent, and not involving incest. Table 1 gives the coefficients of relationship for all of them. 192 are relationships between first cousins. In 66 cases the coefficients may be raised by monozygotic twinning. The effect of relationship on incompatibility between mother and foetus is described. There is a brief discussion of relationships involving incest, and those between second cousins.
18 citations
TL;DR: The woodlouse, Ardillidium vulgare, is polymorphic for body colours, and some types are sex-limited to females, and this could be a cause maintaining the polymorphic structure of populations.
Abstract: 1. The woodlouse,Armadillidium vulgare, is polymorphic for body colours. 2. The rarer types of body colour may be due to either dominant or recessive factors. Some types are sex-limited to females. 3. Populations near Cambridge were scored for different colour types. About 12 per cent of the females were of the rarer types. 4. There was evidence in the case of the dominant factor for red body colour that heterozygotes were more viable than homozygotes. 5. Woodlice are eaten by birds, and this could be a cause maintaining the polymorphic structure of populations.
9 citations
TL;DR: A study to establish whether parthenogenesis occurs in unfertilized eggs of mated turkeys found that Plumage color of both Dark Cornish chickens and New Jersey Buff turkey males is dominant to the recessive white of the Beltsville Small White turkey hens.
Abstract: A study, involving a genetic color marker, was conducted to establish whether parthenogenesis occurs in unfertilized eggs of mated turkeys One hundred and forty-eight Beltsville Small White turkey hens, representing a strain selected for a high incidence of advanced parthenogenetic development, were inseminated with semen from Dark Cornish chickens Sixteen other selected turkey hens were inseminated with partially inactivated semen from homozygous New Jersey Buff turkey males Plumage color of both Dark Cornish chickens and New Jersey Buff turkey males is dominant to the recessive white of the Beltsville Small White turkey hens
8 citations
TL;DR: For slight selection or loose linkage coupling and repulsion should be equally frequent and there is an equilibrium when almost all or almost none of the double heterozygotes are in coupling.
Abstract: Selection in favour of double heterozygotes leads to different types of equilibrium according to the linkage between the loci concerned. For slight selection or loose linkage coupling and repulsion should be equally frequent. When the selection or the linkage becomes sufficiently intense there is an equilibrium when almost all or almost none of the double heterozygotes are in coupling.
6 citations
5 citations
TL;DR: SummaryExpressions are found for the effect of natural selection under a certain hypothesis and the effects are similar to those found in the literature on evolution of infectious disease.
Abstract: SummaryExpressions are found for the effect of natural selection under a certain hypothesis.
5 citations
TL;DR: A model is specified based on the assumption of an oversimplified situation: a measurable character fully determined by a single diallelic locus, which is shown to be complete and contains no contradictions to the features of processes verified to exist in artificial or natural selection.
Abstract: A model is specified based on the assumption of an oversimplified situation: a measurable character fully determined by a single diallelic locus. The generality of the model is shown to be complete.
4 citations
TL;DR: Analysis of Howard’s data on the genetics ofmadillidium vulgare gives strong evidence in favour of the view that heterozygotes are generally more viable than homozygotes in early life.
Abstract: As analysis of Howard’s data on the genetics ofArmadillidium vulgare gives strong evidence in favour of the view that heterozygotes are generally more viable than homozygotes in early life.
4 citations
TL;DR: In this paper, the map distance between the microsporic lethal genex and the marker genej of linkage group V was estimated from backcross data to be 7·2.
Abstract: 1. Data from F1, F2, and F3 generations indicate that asynapsis seen in PMC in a Marglobe plant of tomato was genetically controlled. 2. The segregation for asynapsis in F2 was not monogenic. Asynapsis in a F3 generation raised from selfing an asynaptic F2 plant was variable and did not affect all the plants. Therefore the asynpsis gene(s) had incomplete penetrance and/or modifiers. 3. The presence of aneuploids, primarily trisomics, in F1 indicates that asynpasis was operative in megasporocyte, as well. 4. The map distance between the microsporic lethal genex and the marker genej of linkage group V was estimated from backcross data to be 7·2. 5. One aneuploid contained as many as 9 or 10 extra chromosomes in PMC. This observation extends the known upper limit of the chromosomes in the aneuploid tomato. 6. A perfect association of orange anther colour with tangerine flesh colour and yellow anther colour with red flesh colour was found in this study.