wilboisa000
25.07.2019 •
Biology
The pacific plate is an oceanic tectonic plate.how did a hot spot and the pacific plate interact to for the hawaiian islands
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Ответ:
The Pacific plate is an oceanic tectonic plate.how did a hot spot and the Pacific plate interact to for the hawaiian islands
Explanation:
Although most of the world's volcanoes came out of geological activity at the limits of the tectonic plates, the hot spot of Hawaii is far from these limits.
Those in Hawaii, is due to a sudden change in the movement of the Pacific plate. However, recent investigations of this irregularity led to the proposal of the movable hot-spot theory in 2003, which suggests that hot spots are mobile instead of fixed, and that the curve, which is 47 million years old, It was caused by a change in the movement of the hot spot instead of the movement of the plate.
Ответ:
Ответ:
Aislamiento postreproductivo: Esterilidad del híbrido
Explanation:
El concepto biológico de especie, en su definición, destaca que los ejemplares de una especie no pueden entrecruzarse con ejemplares de otra especie distinta, o bien, en caso de hacerlo, no hay éxito reproductivo.
Existen distintos mecanismos de aislamiento reproductivo, que son barreras que inhiben o interrumpen el flujo génico entre especies distintas. Se trata de caracteres biológicos propios de cada especie que previenen la reproducción con otras especies.
Estos mecanismos de aislamiento reproductivo pueden ser precigóticos o postcigóticos.
Pre-copulatorios o pre-cigóticos:Ecológico o por aislamiento de hábitat; Estacional o temporal; Sexual o etológico; Mecánico; Por incompatibilidad de gametas.2.Post-copulatorios o cigóticos:
Inviabilidad del híbrido; Esterilidad del híbrido; Híbrido con viabilidad o fertilidad disminuido; Interacciones citoplasmáticas.La mula es producto de la cruza entre dos especies distintas: una yegua (Equus ferus caballus) y un burro (Equus africanus asinus). Es un ejemplo de la accion de mecanismo poscigótico, en el cual se forma un híbrido viable esteril. Este ejemplar puede nacer crecer y sobrevivir, pero que no pueden producir gametas funcionales, por lo cual no pueden reproducirse.