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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...
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...
Testing a Claim about Population Proportion01:24

Testing a Claim about Population Proportion

A complete procedure for testing a claim about a population proportion is provided here.
There are two methods of testing a claim about a population proportion: (1) Using the sample proportion from the data where a binomial distribution is approximated to the normal distribution and (2) Using the binomial probabilities calculated from the data.
The first method uses normal distribution as an approximation to the binomial distribution. The requirements are as follows: sample size is large...
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...
X-Inactivation01:58

X-Inactivation

The human X chromosome contains over ten times the number of genes as in the Y chromosome. Since males have only one X chromosome, and females have two, one might expect females to produce twice as many of the proteins, with undesirable results.
X-inactivation01:58

X-inactivation

The human X chromosome contains over ten times the number of genes as in the Y chromosome. Since males have only one X chromosome, and females have two, one might expect females to produce twice as many of the proteins, with undesirable results.

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Related Experiment Video

Updated: May 27, 2026

Establishment of Rat Models Mimicking Gender-affirming Hormone Therapies
06:24

Establishment of Rat Models Mimicking Gender-affirming Hormone Therapies

Published on: January 10, 2025

On Das Gupta's 'Birth function in a two-sex model'.

S Mitra

    Population Studies
    |November 15, 2011
    PubMed
    Summary

    This study addresses criticisms of a two-sex model, asserting that the critiques are unfounded. Further explanation will clarify the model's development and validity in population dynamics.

    Area of Science:

    • Population dynamics
    • Mathematical modeling
    • Sex ratio theory

    Background:

    • A critique by Das Gupta challenges the author's previously proposed two-sex model.
    • The author aims to refute these criticisms and clarify the model's foundation.

    Purpose of the Study:

    • To address and rebut specific criticisms leveled against the two-sex model.
    • To provide a detailed defense of the author's approach to developing the two-sex model.

    Main Methods:

    • The author will present a point-by-point refutation of Das Gupta's critique.
    • The response will re-examine the theoretical underpinnings of the two-sex model.

    Main Results:

    • The criticisms presented by Das Gupta are demonstrated to be without merit.

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    Establishment of Rat Models Mimicking Gender-affirming Hormone Therapies
    06:24

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    Published on: January 10, 2025

    Measuring Embryonic Viability and Brood Size in Caenorhabditis elegans
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    Measuring Embryonic Viability and Brood Size in Caenorhabditis elegans

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  • The author's two-sex model is defended as a valid approach.

    • Conclusions:

    • The author's two-sex model remains a robust framework for population dynamics.
    • Further dialogue is encouraged to refine understanding of sex-structured population models.