• The genetics of cotton - XIX. Normal alleles of the crinkled mutant ofGossypium barbadense L. differing in dominance potency, and an experimental verification of fisher’s theory of dominance

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    • Abstract

       

      1. The dominance relations of the crinkled mutant ofGossypium barbadense L. have been studied in an extensive series of backcrossing experiments, involving six species of New World cottons.

      2. It is believed that there have been two methods by which dominance at the crinkled locus in the six species of New WorldGossypiums has been attained. The first method is that proposed by Fisher, whereby dominance has been reached by modification of the heterozygous phase (hirsutum, purpurascens, andTaitense). The modifiers improving the heterozygous phase have simultaneously improved the recessive. The second method is that proposed by Haldane, in which dominance is attained by the employment of a normal allele of great dominance potency (barbadense, tomentosum, andDarwinii), the recessive phase being relatively unmodified.

      3. Some conditions under which the Fisher effect is operative are discussed.

      4. Evidence is brought forward indicating that the normal allele ofbarbadense,CRB, may become mutable on the genetic background of one type ofpurpurascens.

    • Author Affiliations

       

      Sydney Cross Harland1 Olga M. Atteck1

      1. Institute of Cotton Genetics, Sociedad Nacional Agraria, Lima, Peru
    • Dates

       
  • Journal of Genetics | News

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