A DROSOPHILA INTERSEX-TRIPLOID

A diploid-triploid (60,XX/90,XXY) intersex in a Holstein heifer.

The diploid/triploid (60,XX/90,XXY) condition in Bos taurus is very rare and only three cases have been published previously. The present animal exhibited an aplastic vulva, penis and clitoris agenesis, a male-like urethra located in a pseudoprepuce opening between the mammary complexes and a well developed M. rectipeninus. A normal (60,XX) female karyotype was detected in lymphocyte cultures w...

Triploid Intersexuality in Drosophila Americana Spencer.

Autonomy and nonautonomy of sex determination in triploid intersex mosaics of C. elegans.

The primary sex-determining signal in Caenorhabditis elegans is the ratio of X chromosomes to sets of autosomes (X/A ratio), normally 1.0 in hermaphrodites (XX) and 0.5 in males (XO). XX triploids (X/A = 0.67) are males, but if these animals carry a partial duplication of the X chromosome such that X/A approximately equal to 0.7, they develop as intersexes that are sexually mosaic. We have anal...

Intersex Modifying Genes in Wild Strains of Drosophila Melanogaster.

HE sex determining mechanism in diploid Drosophila melanogaster is T completely stable. No intersexual individuals are produced from hybridizing strains of D. melanogaster collected from widely separated geographical localities. In Lymantria, on the contrary, GOLDSCHMIDT (1934) has shown that the potencies of the X chromosome sex gene differs in races from Europe and Japan. The degree of sexual...

A genetic analysis of intersex, a gene regulating sexual differentiation in Drosophila melanogaster females.

Sex-type in Drosophila melanogaster is controlled by a hierarchically acting set of regulatory genes. At the terminus of this hierarchy lie those regulatory genes responsible for implementing sexual differentiation: genes that control the activity of target loci whose products give rise to sexually dimorphic phenotypes. The genetic analysis of the intersex (ix) gene presented here demonstrates ...