Diferencia entre dominio incompleto y codominio

Gregor John Mendel propuso las leyes de Herencia y Dominio, más tarde, el término “ Dominio incompleto ” fue acuñado por Carl Correns, un botánico alemán. Un individuo heterocigoto es producido por los alelos de un rasgo. Los caracteres dominantes y recesivos se expresan en un dominio incompleto, así como en un codominio.

Dominio incompleto vs Codominio

La principal diferencia entre Dominio incompleto y Codominio es que el dominio incompleto incluye el cruce de alelos de dos padres y la descendencia será una progenie intermedia sin un dominio completamente dominante ni rasgo recesivo, mientras que Codominance se puede ver cuando los padres mezclan los fenotipos que son evidentes en la progenie. Como resultado, no existe una característica dominante ni recesiva.

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El dominio incompleto ocurre cuando la descendencia tiene un fenotipo intermedio de ambos padres. La aportación expresada por los padres es distinta en la progenie. Cuando una persona es heterocigota para un gen, posee dos alelos distintos, pero esto no es necesariamente suficiente para producir un fenotipo intermedio. El dominio incompleto puede ser causado por un gen que oculta el fenotipo del otro.

La codominancia resulta cuando los fenotipos de los alelos están en valores casi iguales presentes en la descendencia. Un ejemplo popular de este tipo es el grupo sanguíneo ABO. El modelo de Mendel se puede usar para predecir los resultados de los cruces de co-dominio de los alelos. La generación F1 tendrá una relación genotípica de 1: 2: 1. La codominancia es una interacción entre dos genes en los que ambos genes exhiben y expresan sus rasgos al mismo tiempo, de acuerdo con la ley de codominancia.

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Tabla de comparación entre dominio incompleto y codominio

Parámetros de comparación Dominio incompleto <TAG los rasgos dominantes y recesivos se expresan en sus características. Fenotipo expresado Descendiente intermedia Descendiente independiente Dominio Uno de los rasgos del alelo se vuelve dominante sobre otro Ambos alelos no actúan como dominantes o recesivos sobre otro Fenotipo Los fenotipos de los padres no se puede ver en la descendencia Los fenotipos de los padres se pueden ver en la descendencia Ejemplos Cruce de flores rojas ABO Grupo sanguíneo

¿Qué es el dominio incompleto?

El dominio incompleto es el resultado de dos padres reales que cruzan para formar una descendencia intermedia. Además, también conocido como dominio intermedio o dominio incompleto. Las variaciones de los alelos no tienen caracteres dominantes o recesivos, mientras que el alelo dominante tiene la menor proporción en dominio incompleto. Por ejemplo, el tono rosado de las flores en flor, el estado de los pelos, el tamaño de las manos, el color de los ojos y los tonos de voz en las personas.

Gregor John Mendel fue el primero en dar a descubrir el término de dominio y explicado por un experimento de planta de guisantes. Como se dijo anteriormente, el dominio incompleto es una forma de dominio parcial en el que el fenotipo es intermedio entre los genotipos de alelos dominantes y recesivos. Debido al dominio incompleto, la progenie resultante poseerá un rasgo de color rosa a pesar de los colores rojo dominante y blanco del alelo. Es genéticamente significativo explicar la verdad de que pueden existir alelos separados.

Podemos ver la existencia de un dominio incompleto en las flores de dragón rojo y blanco. Ocurre cuando el alelo dominante no puede dominar por completo el gen recesivo, lo que resulta en un fenotipo que es una mezcla de ambos alelos. La ley de Dominio fue desarrollada por Mendel mostrando que los dos alelos son de carácter dominante y recesivo, y el carácter recesivo está influenciado por el carácter dominante.

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¿Qué es la codominancia?

En este tipo, ambos alelos son independientes de las expresiones en un solo fenotipo. Es una conexión entre alelos de un gen que es similar a una relación de dominio. Ambos alelos se abordan en individuos heterocigotos y tienen impactos separados en su progenie. En codominio, los alelos no reducen la influencia unos de otros y el fenotipo final no es dominante ni recesivo.

Los impactos de ambos alelos son evidentes por separado en el gen fenotípico. La codominancia es un tipo de herencia en la que los dos alelos de un par de genes se expresan completamente en un heterocigoto. Entonces, la mezcla de fenotipos de padres ’ es el resultado que se encuentra en el fenotipo de su descendencia. El rasgo es estudiado popularmente por la flor de flor roja manchada de blanco en plantas y los mamíferos recubiertos de blanco y negro en animales. Se utiliza una herramienta llamada “ Punnett square ” para determinar el tipo de rasgo codominante.

Un ejemplo de codominio es el sistema de grupo sanguíneo ABO. Los alelos A y B son mutuamente dominantes entre sí. Como resultado, el grupo sanguíneo AB no se incluye en ninguna de las dos categorías ( i.e. Grupo sanguíneo A y grupo sanguíneo B ). Debido a la codominancia entre los dos grupos sanguíneos, A y B funcionan como grupos sanguíneos distintos. La beta-talasemia menor con una cadena beta de hemoglobina mutante es un ejemplo de codominio.

Diferencias principales entre dominio incompleto y codominio

  1. La principal diferencia entre el dominio incompleto y la codominancia es que el dominio incompleto es un tipo en el que ambos alelos expresan parcialmente sus fenotipos a la descendencia, mientras que en la codominancia se dan los dos alelos en el fenotipo de su descendencia.
  2. El dominio incompleto no tiene caracteres dominantes o recesivos entre sí. La codominancia no domina completamente a los demás.
  3. Los fenotipos de ambos alelos son igualmente mixtos y transmiten los rasgos a su progenie. Mientras están en codominio, los alelos se mezclan entre sí, pero solo uno de ellos es evidente en la descendencia.
  4. Los híbridos son de un fenotipo no ocurrirán en un dominio incompleto, mientras que el híbrido de un fenotipo tendrá lugar del fenotipo en codominio.
  5. Un ejemplo de dominio incompleto es el tipo de grupo sanguíneo ABO y el cruce de la flor roja y blanca es un ejemplo de codominio.
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Síntesis

El concepto de codominio ocurre cuando la progenie muestra ambos genotipos parentales en proporciones desiguales. El dominio incompleto, por otro lado, es una condición en la cual el niño exhibe un intermedio de ambos genes parentales. El dominio incompleto es, por lo tanto, un rasgo específico de la progenie. La influencia dominante incompleta se puede medir, pero no el impacto codominante.

El modelo de Mendel predice un dominio incompleto de que la generación F1 posterior tendrá una relación genotípica de 1: 2: 1. En genómica cuántica, existe dominio cero si el fenotipo de alelos heterocigotos es igual al de los dos homocigotos. El co-dominio se ve principalmente en plantas y animales de dos colores diferentes, pero también se puede encontrar en características menos evidentes como el tipo de sangre, etc. Como resultado, el dominio conjunto difiere del dominio incompleto de varias maneras.

  1. https://journals.plos.org/plosgenetics/article?id=10.1371/journal.pgen.1007019
  2. https://journals.sagepub.com/doi/abs/10.1177/03635465030310021101

Contenido

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