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Schach [20]
3 years ago
13

Una raza de gallinas, denominada andaluza, presenta plumajes de tres colores negro, blanco y azul. El azul resulta de la combina

ción híbrida de los genes negro y blanco. Averiguar los fenotipos y los genotipos de la descendencia de estos tres cruzamientos:
a) Plumaje azul x plumaje negro.


b) Plumaje azul x plumaje azul.


c) Plumaje azul x plumaje blanco.
Biology
1 answer:
Anna007 [38]3 years ago
4 0

Answer:

a) Genotipo: 50% = 1/2 Nn    -     Fenotipo: 50% = 1/2 Plumaje Azul

                     50% = 1/2 NN   -                       50% = 1/2 Plumaje Negro

b) Genotipo: 50% = 2/4 = 1/2 Nn    -     Fenotipo: 50% = 1/2 Plumaje Azul

                     25% = 1/4 NN                                    25% = 1/4 Plumaje Negro

                     25% = 1/4 nn                                     25% = 1/4 Plumaje Blanco

c) Genotipo:  50% = 1/2 Nn    -     Fenotipo: 50% = 1/2 Plumaje Azul

                     50% = 1/2 nn   -                       50% = 1/2 Plumaje Blanco

Explanation:

Datos:

Llamaremos al Gen para color del plumaje: N

Alelo dominante N para color negro

Alelo recesivo n para color blanco

Animales con genotipo homocigota para alelo dominante, NN, expresan plumaje negro

Animales con genotipo homocigota recesivo, nn, expresan plumaje blanco

Animales con genotipo heterozigota, Nn, expresan color azul.

Este es un ejemplo de dominancia incompleta, en la cual ninguno de los dos alelos domina completamente al otro. El alelo dominante, en este caso N, no puede cubrir el efecto del alelo recesivo, n. Los desendientes, entonces, poseen un fenotipo intermedio entre los dos fenotipos parentales, que en este caso es el color azul en el plumaje.

Entonces:

a) Plumaje azul x plumaje negro.

Parental) Nn   x   NN

Gametas) N   n   N   N

Cuadrado de Punnet)   N        n

                             N     NN     Nn

                             N     NN     Nn

F1) 1/2 de la progenie es homocigota dominante, NN, color negro

     1/2 de la progenie es heterocigota, Nn, con plumaje color azul

b) Plumaje azul x plumaje azul.

Parental) Nn   x   Nn

Gametas) N   n   N   n

Cuadrado de Punnet)   N        n

                             N      NN     Nn

                             n      Nn      nn

F1) 1/4 de la progenie es homocigota dominante, NN, color negro

     2/4=1/2 de la progenie es heterocigota, Nn, con plumaje color azul

     1/4 de la progenie es homocigota recesivo, nn, con plumaje blanco

c) Plumaje azul x plumaje blanco

Parental) Nn   x   nn

Gametas) N   n   n   n

Cuadrado de Punnet)   N         n

                             n      Nn        nn

                             n      Nn        nn

F1)  1/2 de la progenie es homocigota recesivo, nn, color blanco

     1/2 de la progenie es heterocigota, Nn, con plumaje color azul

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