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Related Concept Videos

The Ratio of X Chromosome to Autosomes02:45

The Ratio of X Chromosome to Autosomes

In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.  
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...
Development of the Sexual Organs in the Embryo and Fetus01:15

Development of the Sexual Organs in the Embryo and Fetus

Development of the reproductive organs in an embryo starts from a bipotential state. This means the early embryo can develop either male or female reproductive organs. The formation of these organs begins with the growth of gonadal ridges that arise from the intermediate mesoderm during the fifth week of development.
Near the gonadal ridges, two duct systems are present: the mesonephric ducts (Wolffian ducts) and paramesonephric ducts (Müllerian ducts). These ducts form the basis for the male...
Background and Environment Affect Phenotype02:27

Background and Environment Affect Phenotype

Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
The Y Chromosome Determines Maleness02:19

The Y Chromosome Determines Maleness

The Y chromosome is a sex chromosome found in several vertebrates and mammals, including humans. In addition to 22 pairs of autosomes, the human males have one X chromosome and one Y chromosome. In these organisms, the presence or absence of the Y chromosome determines the development of male traits.
Evolution
Around 300 million years ago, the two sex chromosomes diverged from two identical autosomal chromosomes. Over time, the Y chromosome has lost most of its genes, shrinking in size. Today,...
Dosage Compensation02:50

Dosage Compensation

In animals, gender is determined by the number and type of sex chromosome. For example, human females have two X chromosomes, and males have one X and one Y chromosome, whereas C.elegans with one X chromosome is a male, and the one with two X chromosomes is a hermaphrodite.
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with  distinct numbers of X chromosomes will have...

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Related Experiment Video

Updated: May 14, 2026

Dissection and Live-Imaging of the Late Embryonic Drosophila Gonad
09:08

Dissection and Live-Imaging of the Late Embryonic Drosophila Gonad

Published on: October 17, 2020

Sex-specific pattern formation during early Drosophila development.

Manu1, Michael Z Ludwig, Martin Kreitman

  • 1Department of Ecology and Evolution, University of Chicago, Illinois 60637, USA.

Genetics
|February 16, 2013
PubMed
Summary

Early dosage compensation in Drosophila is functionally incomplete, leading to sex-biased gene expression. Despite this, downstream gene networks ensure sex-independent segmentation, revealing compensatory mechanisms.

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Last Updated: May 14, 2026

Dissection and Live-Imaging of the Late Embryonic Drosophila Gonad
09:08

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Published on: October 17, 2020

Measuring and Altering Mating Drive in Male Drosophila melanogaster
07:02

Measuring and Altering Mating Drive in Male Drosophila melanogaster

Published on: February 15, 2017

Ex vivo Culture of Drosophila Pupal Testis and Single Male Germ-line Cysts: Dissection, Imaging, and Pharmacological Treatment
08:35

Ex vivo Culture of Drosophila Pupal Testis and Single Male Germ-line Cysts: Dissection, Imaging, and Pharmacological Treatment

Published on: September 11, 2014

Area of Science:

  • Developmental Biology
  • Genetics
  • Drosophila melanogaster research

Background:

  • Dosage compensation equalizes X-linked gene expression between sexes.
  • In Drosophila, this is achieved by doubling X-linked transcription in males.
  • The male-specific lethal complex mediates this post-gastrulation, but early compensation is unclear.

Purpose of the Study:

  • To assess the functional output of early dosage compensation.
  • To investigate sex-biased expression of segmentation genes prior to gastrulation.
  • To understand how downstream gene networks achieve sex-independent development.

Main Methods:

  • High spatiotemporal resolution measurement of even-skipped (eve) expression in male and female embryos.
  • Genetic manipulation of the X-linked transcription factor giant (gt) gene copy number.
  • Analysis of segment proportions in elongated germ-band embryos using eve transgenes.

Main Results:

  • Even-skipped (eve) expression shows a sexually dimorphic pattern, indicating incomplete early dosage compensation.
  • Sex-biased eve patterning is linked to the gene copy number of the X-linked transcription factor giant (gt).
  • Downstream gene networks produce sex-independent segmentation despite sex-biased eve expression.

Conclusions:

  • Early dosage compensation in Drosophila is functionally incomplete.
  • Autosomal gene or pathway-specific mechanisms compensate for incomplete early dosage compensation.
  • Sex-independent segmentation is robust despite sensitivity to Eve expression levels.