• On the genetic analysis of a heterozygotic plant ofScolopendrium vulgare

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    • Abstract

       

      1. A normal looking plant ofScolopendrium vulgare of unknown origin proved, when its spores were sown, to be heterozygotic, and to behave like a hybrid plant of theF1 generation.

      2. The progeny when the spores were sown together showed segregation of the entire-leaved and incised-leaved characters. There were about 75% of the former and 25% of the latter type.

      3. The incised-leaved plants bred true, behaving like extracted recessives.

      4. The two entire-leaved plants of theF2 generation that have been bred from have segregated in the same way as the original plant. They behave as impure dominants; the entire-leaved character being completely dominant to the incised-leaved.

      5. Pure dominant plants have not so far been proved to be present in theF2 generation, though there is no reason to suspect their absence.

      6. Isolated single prothalli produce either entire-leaved or incisedleaved plants, not both. Assuming that segregation occurred at spore formation, plants thus obtained should be genetically pure. This is the most direct method of obtaining all possible pure combinations in a homosporous fern. It also applies to the genetic study of the Bryophyta.

      7. The original plant showed somatic segregation of the entireleaved and incised-leaved characters in the two halves of one leaf.

    • Author Affiliations

       

      William H. Lang1

      1. Barker Cryptogamic Research Laboratory, University of Manchester, UK
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  • Journal of Genetics | News

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