GIẢI BÀI TẬP SINH HỌC 9 NGUYỄN VĂN SANG VÀ NGUYỄN THỊ VÂN THƯ VIỆN TRƯỜNG THCS NGÔ THÌ NHẬM ĐÀ NẴNG
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- Lam the nao de chQn duqc ru6i } 1 co than xam la thuan 1thung de·<br />
mang lai ? Giai thich va minh hQa '!<br />
- ' Lp SO' do tu P den f 2<br />
cho phep lai tren.<br />
b. Neu cho Fl thu dUQ'C trong phep lai tren lai phan tich thi ket qua<br />
kieu hinh to ra se nhu the nao ?<br />
D.S:<br />
- Dung phep lai phan tich. (HQc sinh llf giai thich va minh hQa.)<br />
- p : BB x bb -- F I<br />
: Bb x Bb<br />
b. Ket qua : 1 than xam : 1 than den<br />
a.<br />
Bai 1 : Khi cho giao phoi giua ga trong long tr.ing voo ga mai long<br />
den du thuan chung, ngum ta thu dUQ'C cac con lai f I<br />
du co mau<br />
long xanh da troi.<br />
Biet gen qui djnh tinh trng m\m tren NST thuO'Ilg va long den tr.S :<br />
a. Mau long di truyn theo hin tuqng tinh tr(>i khong hoan toan.<br />
M : long den; Aa .: long xarih da troi;<br />
aa : long tning<br />
P : M (den) x aa (tnfog)<br />
b. Ket qua : 1 long den : 2 long xanh da troi : 1 long trang<br />
Cho biet & m(>t loai du, ht xam tr(,i hoan toan so vm ht tring.<br />
Du&i day la bang thong ke iY m{>t so phep lai :<br />
Kieu hinh cu.a p So cay' F 1<br />
mt xam<br />
Ht tring<br />
a. Ht xam x h;;tt tnfog 85 87<br />
b. ff;;tt xam x h;;tt xam 210 70<br />
c. Ht xam x ht trang 150 0<br />
Hay giiti thich va lp so· do cho m6i phep lai tren.<br />
f>.S : A : hc.1t xam, a : hc.1t triing<br />
a. P : Aa x aa; b. P : Aa x Aa; c. P : M x aa<br />
Bai 9 : Biet & trau, mau long den tr(>i hoan toan so voi mau long tr.ing<br />
va gen, qui dinh tinh trng m\m tren NST thuong.<br />
M(>t trau tr.ing (1) giao phoi voi m(>t trau den (2), de Ian thu nhat duoc<br />
m