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X-linked Traits

X-linked Traits

In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.

X-linked Traits

X-linked Traits

In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.

Human Genetics

Human Genetics

Human genetics provides a profound framework for understanding the interplay between genetic predispositions and human psychology. At the heart of this discipline lies the study of how genes influence physical traits, behaviors, and susceptibility to diseases. Each person carries a unique genetic code that subtly or significantly shapes their psychological and behavioral landscape.
The complex relationship between genetics and psychology is observable through common biological components such...

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Related Experiment Video

Updated: May 11, 2026

In Vivo Modeling of the Morbid Human Genome using Danio rerio

In Vivo Modeling of the Morbid Human Genome using Danio rerio

Published on: August 24, 2013

Modelling human genetic disorders in Xenopus tropicalis.

Helen Rankin Willsey^1,2, Eleanor G Seaby³, Annie Godwin⁴

¹Department of Psychiatry and Behavioral Sciences, Weill Institute for Neurosciences, University of California San Francisco, San Francisco, CA 94158, USA.

Disease Models & Mechanisms

|June 4, 2024

Summary

The frog Xenopus tropicalis offers a powerful model for studying human genetic diseases. Its use allows for large-scale functional analyses of disease-related genes and variants.

Keywords:

Xenopus tropicalis CRISPR Disease Genetics

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Last Updated: May 11, 2026

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Published on: August 24, 2013

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Published on: January 30, 2016

Primordial Germ Cell Transplantation for CRISPR/Cas9-based Leapfrogging in Xenopus

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Area of Science:

Genetics
Developmental Biology
Comparative Genomics

Background:

Human disease genetics is rapidly advancing, identifying numerous genetic variants linked to disease.
There is a growing need for efficient in vivo model systems for large-scale functional genetic studies.
Understanding conserved pathobiological mechanisms requires robust model organisms.

Purpose of the Study:

To provide a practical guide for using Xenopus tropicalis to study human genetic disorders.
To highlight Xenopus tropicalis as a model for uncovering conserved pathobiology.
To discuss key considerations for modeling human genetic diseases in vivo.

Main Methods:

Utilizing Xenopus tropicalis as a diploid model organism.
Focusing on genetic architecture, conservation, and phenotyping strategies.
Addressing complex topics like penetrance, expressivity, and sex differences.

Main Results:

Xenopus tropicalis enables scalable functional analyses of human disease genes and variants.
The model facilitates the discovery of conserved mechanisms underlying human diseases.
Key considerations for effective disease modeling in Xenopus are outlined.

Conclusions:

Xenopus tropicalis is a cost-effective, rapid, and high-throughput model organism.
It is an essential tool for understanding gene function in development and disease.
The model aids in deciphering gene function and disease mechanisms relevant to human health.