• A. M. Frederikse

      Articles written in Journal of Genetics

    • Rudimentary parthenogenesis inTenebrio molitor L.

      A. M. Frederikse

      More Details Abstract Fulltext PDF

      It is evident that in animals belonging to the most different groups, the unfertilized eggs have more or less the power to develop. This is therefore a common property of the egg cell. Control experiments are therefore in experimental parthenogenesis a necessity. The development takes place very slowly and is irregular. The development frequently stops early, after which degeneration sets in. The mitosis is often irregular. There is perhaps budding and amitosis.

      The virgin females I used in this research were sent me by Mr Arendsen Hein, Utrecht; I wish to thank him in this place. As the females were separated in the pupal state, the possibility of fertilization was absolutely excluded.

    • Species crossing in the genusTenebrio

      A. M. Frederikse

      More Details Abstract Fulltext PDF

      In species-crosses in the genusTenebrio fertilisation of the egg does take place.

      Owing to the deviations from the normal in mitosis the embryo does not reach the larval stage.

      Embryonic development differs greatly in abnormality and in the stages it reaches.

      This greatly differing development, taken in conjunction with the greatly varying emission of chromosomes, may be taken as supporting the theory of chromosome-heredity.

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