III. HOAT DONG DAY HOC 1 Kiem tra
2. Co sd di truyen cua uu the lai (Gia thidt si6u
uu the lai (Gia thidt si6u
Hogt dpng cda GV
- GV nhan xet, danh gia
va bd sung kidn thflc.
- GV gidi thieu them vd mdt sd gia thidt giai thfch nguyen nhan uu thd lai
+ Trang thai dj hgp tfl: Trong CO thd lai phdn ldn cac gen ndm trong cap dj hgp. Trong dd gen lain khdng dugc bieu hien.
AABBCC X aabbcc -^
AaBbCc
+ Tac dung cdng gdp cua cdc gen trdi cd lgi
AAbbCC X aaBBcc -^
AaBbCc
the hien rd d tfnh traijg da gen.
Hogt dpng cda HS + Gen lan khdng dugc
bidu hien trong cap di hgp.
- Dai dien HS tra ldi —> ldp nhan xet bd sung.
Noi dung
- C) trang thai dj hgp tu vd nhieu cap gen khac nhau con lai cd dugc kidu hinh vugt trdi nhieu mat so vdi cdc dang bd me cd nhidu gen d trang thai ddng hgp tfl (ke ca ddng hgp tfl trdi). - Bidu didn so dd
AA < Aa > aa - VD: d cay thudc la. + Cap gen aa quy djnh kha nang chju lanh tdi
10"C.
+ Cap gen AA quy dinh khd nang chju ndng tdi 35"C.
+ cay cd cap gen Aa chju dugc nhiet do tit
Hogt dpng cda GV Hogt dpng cda HS Npi dung
- GV n6u vdn dd:
+ Con lai cd nhidu dac diem vugt trdi so vdi bd me.
+ Lam thd nao tao dugc uu thd lai?
- GV nhan xet, danh gia va giup HS hoan thien kie'n thflc.
- HS nghien cun SGK trang 77 muc 3.
- Trao ddi nhdm thdng nhdt y kidn.
- Y6u cdu n6u dugc. + Tidn hanh lai nhieu ldn dd cd gidng thudn (AA, aa).
+ Tao dugc nhidu cap gen dj hgp Aa vd tfnh trang mong mud'n.
- HS trinh bay trudc ldp, cd thd bidu didn bdng so dd.