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tankabanditka [31]
3 years ago
5

En un experimento un floricultor cruzó plantas de flores púrpuras con plantas de flores blancas, los resultados obtenidos durant

e la primera generación fueron de un 100% de flores púrpuras, y en la segunda generación un 25% de flores serán de color blanco y el resto de color púrpura. Los genotipos de los parentales (P)
Biology
1 answer:
aliina [53]3 years ago
8 0

Answer:

Los genotipos de los parentales son:

- pp (homicigota dominate con flores púrpura)

- bb (homocigota recesivo con flores blancas)  

Explanation:

Alelos:

p: púrpura y b: blanco

Genotipos parentales:  

- pp: homocigota dominante (flores púrpura)

- bb: homocigota recesivo (flores blanca)

Cruzamiento parental: pp X bb

F1: 100% pb  

Cruzamiento F1: pb X pb

F2: 25% pp (flores púrpuras), 50% pb (flores púrpuras) y 25% bb (flores blancas)

En este caso, el alelo que determina el color púrpura es dominante sobre el alelo que determina el color blanco. Es por esta razón que en la F1 todas las plantas heterocigotas exhiben un fenotipo con flores púrpura. En la F2 la proporción fenotípica será 1:2:1 (1 homocigota dominante, 2 heterocigotas y 1 homocigota recesivo), mientras que la proporción genotípica será 3:1 (3 plantas con flores púrpuras y 1 planta con flores blanca).

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