III. HOAT DONG DAY HOC 1 Kiem tra
a) Nhdn bdn vd tinh or
Hogt dpng cda GV + Tra ldi cau hdi viec
nhan ban vd tfnh ddng vat dem lai lgi fch gi?
- GV nhan xet va yeu cdu HS khai quat kidn thflc.
- GV cho HS quan sat tranh so dd cdy truydn phdi bd.
- GV y6u cdu:
+ Trinh bay quy trinh cdy truyen phdi.
+ Khai quat thanh khdi niem.
+ Neu lgi fch.
- GV nhan xet, ddnh gid.
Hogt ddng cdaHS - Dai dien HS trinh bay
tren so dd.
- HS gidi thieu thdnh tuu nhan ban vd tfnh d lgn, bd.
Ndi dung
- HS van dung kidn thflc
sinh hgc va kidn thflc bd mdn cdng nghe 10 dd trinh bay.
- Ldp nhan xet, bd sung.
- Ldy trflng rdi tach bd nhan (cflu cho trflng). - Ldy td bdo vu, tdch nhan (cflu cho nhan). - Dua nhan vdo td bao trflng.
- Nudi trflng -> phdt tridn thanh phdi.
- Cay phdi vao tfl cung cua cflu khac dd phdi phat trien va sinh ra binh thudng.
- Cilfu con cd kidu hinh gidng cflu cho nhan.
b) Cdy truyen phoi
Cdy truyen phdi la kT thuat phan cdt phdi ddng vat thanh nhidu phdi, rdi cdy cac phdi nay vao tfl cung cua cac con vat khdc nhau, tao ra nhidu con vat cd kieu gen gid'ng nhau.
4. Kiem tra danh gia
- GV yeu cdu HS hoan thanh bai tap 1,2 SGK trang 82. - GV thdng bao dap an -> HS trao ddi bai va sfla chfla. 5. Dan do
- Hgc bai, tra ldi cau hdi SGK. - On tap kidn thflc ve gen.
Bai 20
K *