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EXERCICE SUR LE MAD

Analyse

  1. Un éleveur de caprins croise un bouc noir avec une chèvre blanche. Il obtient à la F1des chevrons noirs lorsqu’il croise de nouveau les F1 entre eux mâles et femelles que va-t-il avoir à la F2 ?

2. Le croisement de deux lapins gris donne 13 lapereaux dont 10 sont gris et les restes sont blancs.

  1. Déterminez les génotypes des parents et justifiez ?
  2. Comment appelle-t-on les parents de ce type ?

De quel croisement sont-ils les résultats ?

  1. Donnez le génotype et le phénotype de grands parents.

Comment calculer les répartitions en F2 ?

Analyse

Interprétation

Effectif  Total = 13 c’est-à-dire

10+ ?= 10+3 = 13

 

  1. Génotypes des parents Gb
  2. Ce sont les hybrides

Ils sont issus des parents purs : Gb et Gb

  1. Phénotype de grands parents gris : GG

                                              Blanc : bb

MessagesTimelineExceptionsViews7RouteQueries16Models18GateSessionRequest
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