Предмет: Биология, автор: razi005

пожалуйста помогите. срочно надо. с подробным решением((((
фенилкетонурия и голубой цвет глаз наследуются как аутосомные рецессивные признаки.У кареглазых родителей родился голубоглазый ребенок с фенилкетонурией. какова вероятность рождения голубоглазых здоровых детей?

Ответы

Автор ответа: gib56
0
А-карие
а- голубые В- здоровый
в-ФКН (больной)

 родители  АаВа х АаВв А_В_  3
дети аавв
ааВ_-?
т.к родители были здоровы, но у них родился больной ребенок то они были дигетерозигоны по данным признакам. 
  Р    АаВв                      х                  АаВв
G   АВ  Ав  аВ ав                    АВ   Ав  аВ  ав
чертим решетку Пеннета,  согласно третьему закону Менделя у дигитерогизот наблюдается расщепление по фенотипу 
9 А_В_   (АААВВ,ААВв ААвв,АаВв,)  3Аавв (Аавв ААвв)  3 аа В_ ((ааВВ,ааВв) - голубоглазые и здоровые 1 аавв,  составляем пропорцию и решаеи 3*100 :16 = 18,75 %
ответ 18,75% голубоглазых и здоровых детей 
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