Video Experimental Relacionado
Updated: Feb 26, 2026
10:43
Dissection of Larval Zebrafish Gonadal Tissue
Published on: April 26, 2017
11.1K
Sistemas de determinación del sexo distintos en dos especies estrechamente emparentadas de piscardo euroasiático
Temitope Opeyemi Oriowo1, Sophie Helen Smith1, Jana Thorman1
1Leibniz Institute for the Analysis of Biodiversity Change, Museum Koenig Bonn, Bonn, Germany.
Heredity
|February 24, 2026
Resumen
Dos especies estrechamente emparentadas de piscardo euroasiático, Phoxinus phoxinus y Phoxinus csikii, presentan sistemas de determinación del sexo distintos. Phoxinus phoxinus tiene un sistema heterogamético macho (XX/XY), mientras que Phoxinus csikii tiene un sistema heterogamético hembra (ZZ/ZW).
Área de la Ciencia:
- Genómica
- Biología Evolutiva
- Ictiología
Sus antecedentes:
- Los peces teleósteos exhiben diversos mecanismos de determinación del sexo.
- Los piscardos euroasiáticos (Phoxinus) son conocidos por su hibridación, pero sus sistemas de determinación del sexo no han sido estudiados.
- Comprender la determinación del sexo en especies estrechamente emparentadas revela procesos evolutivos.
Objetivo del estudio:
- Investigar la base genética de la determinación del sexo en Phoxinus phoxinus y Phoxinus csikii.
- Identificar regiones genómicas asociadas al sexo en estas especies de piscardos.
- Determinar si especies estrechamente emparentadas de Phoxinus comparten mecanismos de determinación del sexo.
Principales métodos:
- Se empleó la secuenciación del genoma completo para ambas especies.
- Se utilizaron análisis basados en cobertura, polimorfismos de nucleótido único (SNP) y k-mers.
- Se identificaron regiones genómicas asociadas al sexo a través de enfoques genómicos comparativos.
Principales resultados:
- La cobertura sexualmente sesgada no indicó cromosomas sexuales homomórficos en ninguna de las especies.
- Phoxinus phoxinus exhibe un sistema heterogamético macho (XX/XY) con SNPs ligados al sexo en los cromosomas 3 y 12.
- Phoxinus csikii muestra un sistema heterogamético hembra (ZZ/ZW) con SNPs ligados al sexo en el cromosoma 3.
Conclusiones:
- Phoxinus phoxinus y Phoxinus csikii poseen sistemas de determinación del sexo distintos.
- Se identificaron loci genómicos asociados al sexo específicos de la población.
- Mecanismos de determinación del sexo divergentes pueden contribuir al aislamiento reproductivo entre estas especies.
Palabras clave:
determinación del sexoPhoxinuspiscardo euroasiáticosistema heterogamético machosistema heterogamético hembragenómicabiología evolutivaictiologíaMás Videos Relacionados
Videos de Conceptos Relacionados
02:45The Ratio of X Chromosome to Autosomes
9.9K
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...
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female...
9.9K
02:50Dosage Compensation
7.7K
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...
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...
7.7K
02:27Background and Environment Affect Phenotype
7.9K
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...
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...
7.9K
02:19The Y Chromosome Determines Maleness
8.6K
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....
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....
8.6K
02:32X and Y Chromosomes
30.4K
Among mammals, the gender of an organism is determined by the sex chromosomes. Humans have two sex chromosomes, X and Y. Every human diploid cell has 22 pairs of autosomes and one pair of sex chromosomes. A human female has two X chromosomes, while a male has one X chromosome and one Y chromosome.
The germline cells such as egg and sperm cells carry only half the number of chromosomes, i.e., 22 autosomes and one sex chromosome. All eggs have an X chromosome, while sperm cells can carry an X or...
The germline cells such as egg and sperm cells carry only half the number of chromosomes, i.e., 22 autosomes and one sex chromosome. All eggs have an X chromosome, while sperm cells can carry an X or...
30.4K
01:24Testing a Claim about Population Proportion
4.0K
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...
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...
4.0K