SO 9 2011 •~}>''''AiU 57 IVIQt so ldi thutjhg g ^ cua giao vien, hpc sinh khi giai cac bai % Sinii hgc ve phan mpt ^''''bao (2n) tham gia g i ^ phan binh thiithg TS NGUYEN VAN DINH Trudng DHSP Ha Npi 2 1 DA[.]
SO 9-2011 •~}>'AiU 57 IVIQt so ldi thutjhg g ^ cua giao vien, hpc sinh giai cac bai % Sinii hgc ve phan mpt ^'bao (2n) tham gia g i ^ phan binh thiithg TS NGUYEN VAN DINH Trudng DHSP Ha Npi 1.DATVANDE Khi giai eac bai tap sinh hpc vdi npi dung viet giao tQ va tinh ty lp moi loai giao tQ cua cd the dpng vat (2n) giam phan binh thudng thi nhieu giao vien (GV) va hpe sinh (HS) deu thUc hien rat tbt Tuy nhien, nlu bai tap chi cho te bao sinh due eua ed the dpng vat (2n) cd kieu gen nao dd giam phan binh thudng thi ngupc lai, nhieu HS va mpt sb GV lai lung tung, tham ehf cbn giai khdng chinh xac Xuat phat tU II db chung tdi mubn dua mbt phUdng phap cd the khae phuc phan nao nhQng khd khan cho HS va GV giai quylt dang bai tap NHOM BAI TAP Cg THE VA CAC LOI THUdNG GAP CUA HS VA GV 2.1 Mpt sb bai tap eg the Anh (ehj) hay viet ki hieu giao tQ va ty le giao tQ khi: a te bao sinh dgc eua cd the dpng vat (2n) cd kieu gen AaDd giam phan binh thudng b te bao sinh dgc cua cd the dpng vat (2n) cd kieu gen AaXY giam phan binh thudng c te bao sinh dgc cua cd the dpng vat (2n) cd kieu gen ab giam phan binh thudng d te bao sinh dgc dgc cua cd the dbng vat (2n) cb kieu gen jg^ f