Một số dạng bài tập di truyền

).<br /> I<br /> F2<br /> <br /> (P)<br /> (3:1)<br /> <br /> , F1<br /> <br /> -<br /> <br /> ,<br /> <br /> 1:1<br /> <br /> SĐ<br /> SĐ<br /> SĐ<br /> VD1<br /> <br /> , 100% F1<br /> <br /> SĐ<br /> <br /> 1<br /> <br /> :<br /> , 100% F1<br /> : A–<br /> <br /> ;a–<br /> <br /> Đ<br /> <br /> ,<br /> SĐ<br /> <br /> P T /C<br /> <br /> X<br /> AA<br /> A<br /> <br /> GP<br /> <br /> aa<br /> a<br /> <br /> F1<br /> <br /> )<br /> <br /> F1 x F1<br /> G F1<br /> <br /> Aa<br /> <br /> X<br /> <br /> Aa<br /> <br /> A, a<br /> <br /> F2<br /> <br /> A, a<br /> 1 AA : 2 Aa: 1 aa<br /> (3<br /> :1<br /> <br /> )<br /> <br /> nhau.<br /> .<br /> SĐ<br /> <br /> 2<br /> <br /> .<br /> 1<br /> <br /> .<br /> <br /> :<br /> , F1<br /> .<br /> -<br /> <br /> ,<br /> <br /> SĐ<br /> a/ P T /C<br /> AA<br /> A<br /> <br /> GP<br /> <br /> aa<br /> a<br /> <br /> F1<br /> <br /> )<br /> <br /> F1 x F1<br /> <br /> Aa<br /> <br /> G F1<br /> <br /> X<br /> <br /> Aa<br /> <br /> A, a<br /> <br /> F2<br /> <br /> A, a<br /> 1 AA : 2 Aa: 1 aa<br /> )<br /> <br /> F2<br /> <br /> SĐ<br /> SĐ<br /> P T /C<br /> <br /> AA<br /> A<br /> <br /> GP<br /> <br /> aa<br /> a<br /> <br /> F1<br /> SĐ<br /> P T /C<br /> <br /> )<br /> <br /> Aa<br /> A, a<br /> <br /> GP<br /> F1<br /> <br /> aa<br /> a<br /> 1 Aa : 1 aa<br /> )<br /> <br /> 2/<br /> :<br /> SĐ .<br /> :<br /> *<br /> .<br /> <br /> *T<br /> <br /> :<br /> S<br /> .<br /> 2<br /> <br /> SĐ<br /> <br /> 2:<br /> <br /> :<br /> 1<br /> <br /> SĐ .<br /> :<br /> 1<br /> <br /> :<br /> <br /> = 315: 105= 3 : 1<br /> <br /> .<br /> -<br /> <br /> -<br /> <br /> Đ F1<br /> SĐ<br /> <br /> : Aa<br /> <br /> P<br /> <br /> X<br /> Aa<br /> <br /> GP<br /> <br /> Aa<br /> <br /> A, a<br /> <br /> F1<br /> <br /> A, a<br /> 1 AA : 2 Aa: 1 aa<br /> )<br /> <br /> 1<br /> SĐ .<br /> :<br /> P thân cao, F1<br /> <br /> S<br /> .<br /> -<br /> <br /> -<br /> <br /> F1 thân th<br /> S<br /> SĐ<br /> <br /> )<br /> <br /> P<br /> <br /> Thân cao<br /> Aa<br /> <br /> GP<br /> <br /> A, a<br /> <br /> F1<br /> <br /> X<br /> <br /> Thân cao<br /> Aa<br /> A, a<br /> <br /> 1 AA : 2 Aa: 1 aa<br /> )<br /> <br /> 2<br /> .<br /> <br /> 3<br /> <br /> + F1<br /> + F2<br /> <br /> gian<br /> <br /> :<br /> :2 :1<br /> 1<br /> :<br /> .<br /> ?<br /> ?<br /> S<br /> ?<br /> :<br /> , F1<br /> <br /> S<br /> <br /> .<br /> <br /> a/<br /> <br /> SĐ : a,b<br /> Pt/c : ♀<br /> <br /> ♂<br /> <br /> X<br /> AA<br /> A<br /> <br /> GP<br /> <br /> aa<br /> a<br /> <br /> F1<br /> <br /> )<br /> <br /> b/ F1 x F1<br /> <br /> Aa<br /> <br /> G F1<br /> <br /> X<br /> <br /> Aa<br /> <br /> A, a<br /> <br /> F2<br /> <br /> A, a<br /> 1 AA : 2 Aa: 1 aa<br /> )<br /> <br /> c/ P<br /> <br /> ♀<br /> <br /> ♂<br /> <br /> X<br /> AA<br /> A<br /> <br /> GP<br /> <br /> aa<br /> a<br /> <br /> F1<br /> <br /> )<br /> .<br /> <br /> -<br /> <br /> 4<br /> <br /> – nâu<br /> a3 -<br /> <br /> a2 – nâu<br /> -G<br /> <br /> x.( x  1)<br /> 2<br /> <br /> :<br /> <br /> x<br /> <br /> a1 – nâu<br /> 4–<br /> <br /> -<br /> <br /> 2 alen<br /> 1<br /> <br /> :<br /> III<br /> <br /> –<br /> -<br /> <br /> 1<br /> <br /> –<br /> <br /> nâu.<br /> <br /> b/<br /> <br /> .<br /> :<br /> : AA; Aa; Aa1<br /> : aa; aa1<br /> 2 x 3 = 6 SĐ<br /> <br /> SĐ<br /> P<br /> <br /> AA<br /> <br /> GP<br /> <br /> A<br /> <br /> X<br /> <br /> aa<br /> a<br /> <br /> F1<br /> <br /> )<br /> <br /> SĐ<br /> P<br /> <br /> AA<br /> <br /> GP<br /> <br /> A<br /> <br /> X<br /> <br /> aa1<br /> a, a1<br /> <br /> F1<br /> <br /> 1Aa : 1 Aa1<br /> SĐ<br /> <br /> SĐ<br /> SĐ 4: P<br /> SĐ 5: P<br /> SĐ<br /> <br /> Aa<br /> Aa1<br /> 1<br /> <br /> )<br /> <br /> :<br /> x<br /> x<br /> x<br /> <br /> aa<br /> aa<br /> aa<br /> <br /> : AA, Aa, Aa1<br /> <br /> != 6 SĐ<br /> <br /> Kh<br /> SĐ<br /> SĐ<br /> SĐ<br /> SĐ<br /> SĐ<br /> SĐ<br /> <br /> :P<br /> P<br /> <br /> AA<br /> Aa<br /> Aa<br /> 1<br /> <br /> x<br /> x<br /> x<br /> x<br /> <br /> AaBb x AaBb<br /> 9A-B-<br /> <br /> 3A-bb<br /> <br /> 3aaB-<br /> <br /> 1aabb<br /> <br /> 1AaBb<br /> <br /> Aa1<br /> Aa<br /> Aa1<br /> Aa1<br /> <br /> AaBb x aabb<br /> Aabb x aaBb<br /> 1Aabb 1aaBb<br /> <br /> 5<br /> <br /> 1aabb<br /> <br /> 3A-B-<br /> <br /> AaBb x Aabb<br /> AaBb x aaBb<br /> 3Abb 1aaBb<br /> <br /> 1aabb<br /> <br /> AaBb x AaBB<br /> AaBb x AABb<br /> 6A-B-<br /> <br />