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Exam (elaborations)

Preguntas EVAU Biologia

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Varias preguntas que caen siempre en la EVAU de biologia con sus respuestas, con estas preguntas he llegado a sacar buena nota tanto en la evau como en el instituto

Last document update: 1 year ago

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  • September 4, 2023
  • September 4, 2023
  • 11
  • 2023/2024
  • Exam (elaborations)
  • Questions & answers
  • Secondary school
  • Bachillerato
  • 2
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19: En relación con las aportaciones de Mendel al estudio de la herencia:

a)Defina qué es un retrocruzamiento. Describa, utilizando símbolos genéticos, un ejemplo del
mismo (1 punto).

En el caso de los genes que manifiestan herencia dominante, no existe ninguna diferencia
aparente entre los individuos heterocigóticos (Aa) y los homocigóticos (AA), pues ambos
individuos presentarían un fenotipo amarillo.

El retrocruzamiento sirve para diferenciar el individuo homo del
heterocigótico. Consiste en cruzar el fenotipo dominante (A) con la
variedad homocigota recesiva (aa).

Si es homocigótico, toda la descendencia será igual, en este caso se
cumple la primera Ley de Mendel.




Si es heterocigótico, en la descendencia volverá a aparecer el
carácter recesivo en una proporción del 50%.




b)Indique los genotipos y las proporciones fenotípicas de la descendencia obtenida de la
autofecundación de un heterocigoto para dos caracteres




20 Con relación a la Teoría Cromosómica de la Herencia y los cromosomas: (Sep 2016 – B3)

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