• Ursula Philip

      Articles written in Journal of Genetics

    • Mating systems in wild populations ofDermestes vulpinus andMus musculus

      Ursula Philip

      More Details Abstract Fulltext PDF

      It has been demonstrated that a well-defined population ofDermestes vulpinus, consisting of a few thousand members caught from a pile of sheepskins was mating at random, by means of testing the ratio of homozygous to heterozygous animals for a wing and a body-colour factor, for which the species is polymorphic.

      Mice inbred from a population in a Scottish coal-mine, comprising the types yellow-belly and grey-belly, revealed an unexpected lack of heterozygotes. It was concluded that the mice were not mating at random, but break up into comparatively small mating units. This was corroborated by the fact that mice tested for heterozygosis for hidden recessives failed to segregate for any.

      From Dubinin’s data it was concluded that there is no evidence for inbreeding inDrosophila melanogaster.

    • An analysis of chromosomal polymorphism in two species ofChironomus

      Ursula Philip

      More Details Abstract Fulltext PDF

      Two populations ofChironomus dorsalis from two English localities and two ofC. riparius, one from England (my collection) and one from northern Germany (Bauer’s collection), were analysed for the incidence of inversions.

      The chromosomes of different sequences are combined in individuals at random.

      The two homozygotes of chromosome IV could be distinguished from the heterozygote by means of the position of the nucleolus. Analysis of the frequency of the three types showed that mating in the population was at random and that no single type was favoured at the expense of the other.

      The difference in the frequency of some of the sequences found is probably accidental, due to the limited size of the populations.

      No acentric or dicentric fragments were found in the meiosis of males known to have inversions. It was therefore concluded that they were situated outside the chiasma-forming regions and had in consequence no deleterious effect on fertility.

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