Sex in Relation to Chromosomes and Genes

@article{Bridges1925SexIR,
  title={Sex in Relation to Chromosomes and Genes},
  author={Calvin B. Bridges},
  journal={The American Naturalist},
  year={1925},
  volume={59},
  pages={127 - 137}
}
  • C. Bridges
  • Published 1 March 1925
  • Biology
  • The American Naturalist
sions as readily as they do throws considerable doubt on the hypothesis that they are even primarily sex-producing. It may be a mere coincidence. They may be merely sex-indicating and after a case of sex reversal they can not even be that. The sex of the egg may be determined even before fertilization takes place. Many botanists formerly thought that a diploid number of chromosomes was the cause of sporophytic expression and a haploid number the cause of gametophytic expression, but we now know… 

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It is argued that certain of the pure lines of Datura differ slightly from others when grown in comparable pedigrees, but the fact remains that so far as sharply contrasting Mendelian characters are concerned, the jimson weed is highly stable, while the Portulaca is highly mutable.

NON-CRISS-CROSS INHERITANCE IN DROSOPHILA MELANOGASTER

A complete reversal of the ordinary criss-cross inheritance of recessive sex-linked characters occurs in a line of Drosophila recently obtained, and is explicable on the assumption that the two X-chromosomes of the mother are united and behave at reduction as a single body.

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