Sex in Relation to Chromosomes and Genes

  title={Sex in Relation to Chromosomes and Genes},
  author={C. Bridges},
  journal={The American Naturalist},
  pages={127 - 137}
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… Expand
CHAPTER 10 – Sex Determination
This chapter discusses sex determination, the process by which the egg becomes genetically constituted for the role that the eventual organism can assume in gamete production. Expand
Autonomy and nonautonomy of sex determination in triploid intersex mosaics of C. elegans.
The observed patterns of male and female cells in individual animals indicate that sex determination decisions can be influenced by anterior-posterior position and that sex decision can be made as late as the third larval stage of postembryonic development, suggesting that C. elegans is not entirely cell autonomous. Expand
Chromosome Number, Polyploidy, and Sex in the Animal Kingdom
The method of disjunction of the sex genes is particularly interesting to follow in polyploids, and it has been proved that certain types of segregation are favoured compared with others (Rumex acetosa, Drosophila). Expand
The structure and function of the sex chromosomes in man.
The development and application of new techniques for the study of human chromosomes has revealed that the genetics of sex determination in man appears to be different from any other system so far known and may still be accommodated within the limits of a balance theory. Expand
Reversal of an ancient sex chromosome to an autosome in Drosophila
The results reveal several puzzling aspects of Drosophila dot chromosome biology to be possible remnants of its former life as a sex chromosome, such as its minor feminizing role in sex determination or its targeting by a chromosome-specific regulatory mechanism. Expand
Polyploids and sex determination in Caenorhabditis elegans.
There exists on the C. elegans X chromosome at least three (and perhaps many more) dose-sensitive sites that act cumulatively in determining sex. Expand
Sex Determination in Drosophila melanogaster
Current intensive research in this area should lead within the next few years to definitive knowledge at the molecular level of the cascade of differential splicing of regulatory genes, and how this hierarchy ultimately gives rise to the appropriate sex-specific patterns of structural gene expression that underlie sexual dimorphism. Expand
Structure, function and evolution of sex-determining systems in Dipteran insects.
The results show that sex-determining cascades, in comparison to other regulatory pathways, evolve much more rapidly. Expand
Chromosome polymorphism and sex determination in a wild population of tsetse
A natural population of Glossina palpalis palPalis (R-D) found to contain a high incidence of aneuploids, the composition of which may be used to explain the mechanism of sex determination in the genus. Expand
XX Male : Isolation of the First Caenorhabditis elegans Sex-Determination Mutants
THIS article marks the 25th anniversary of a paper (1979), rather than by the absolute number of X chromosomes. The system therefore resembled Drosophila, reporting the first sex-determinationExpand


Variations in Datura Due to Changes in Chromosome Number
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. Expand
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. Expand
Polyploidie und Geschlechterverteilung bei Splachnuin splhericum Schwartz
  • Flora
  • 1923
The Origin of Variations in Sexual and Sex-Limited Characters
Untersuchungen uiber Intersexualitat
  • Zeit . f . ind . Abst . U . Verer .
  • 1920