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B\u00e0i 2 (trang 122 SGK Sinh h\u1ecdc 12):\u00a0H\u00e3y \u0111\u01b0a ra m\u1ed9t gi\u1ea3 thuy\u1ebft gi\u1ea3i th\u00edch qu\u00e1 tr\u00ecnh h\u00ecnh th\u00e0nh m\u1ed9t qu\u1ea7n th\u1ec3 c\u00e2y c\u00f3 kh\u1ea3 n\u0103ng kh\u00e1ng l\u1ea1i m\u1ed9t lo\u00e0i c\u00f4n tr\u00f9ng t\u1eeb m\u1ed9t qu\u1ea7n th\u1ec3 ban \u0111\u1ea7u b\u1ecb s\u00e2u ph\u00e1 ho\u1ea1i.<\/strong><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
Gi\u1ea3 thuy\u1ebft: Do \u0111\u1ed9t bi\u1ebfn gen ho\u1eb7c bi\u1ebfn d\u1ecb t\u1ed5 h\u1ee3p, c\u00f3 m\u1ed9t s\u1ed1 c\u00e2y tr\u1ed3ng c\u00f3 th\u1ec3 t\u1ef1 s\u1ea3n sinh ra m\u1ed9t s\u1ed1 ch\u1ea5t \u0111\u1ed9c \u0111\u1ed1i v\u1edbi c\u00f4n tr\u00f9ng. Trong \u0111i\u1ec1u ki\u1ec7n b\u00ecnh th\u01b0\u1eddng (kh\u00f4ng c\u00f3 s\u00e2u h\u1ea1i), nh\u1eefng c\u00e2y c\u00f3 ch\u1ee9a c\u00e1c ch\u1ea5t \u0111\u1ed9c n\u00e0y ph\u00e1t tri\u1ec3n ch\u1eadm ho\u1eb7c y\u1ebfu h\u01a1n c\u00e2y kh\u00e1c (v\u00ec ph\u1ea3i ti\u00eau t\u1ed1n th\u00eam n\u0103ng l\u01b0\u1ee3ng ng\u0103n ch\u1eb7n t\u00e1c h\u1ea1i c\u1ee7a ch\u1ea5t \u0111\u1ed9c \u0111\u1ed1i v\u1edbi ch\u00ednh m\u00ecnh ho\u1eb7c b\u00e0i ti\u1ebft ch\u1ea5t \u0111\u1ed9c ra ngo\u00e0i). Tuy nhi\u00ean, khi s\u00e2u h\u1ea1i xu\u1ea5t hi\u1ec7n th\u00ec h\u1ea7u h\u1ebft c\u00e1c c\u00e2y kh\u00e1c b\u1ecb ch\u1ebft ch\u1ec9 c\u00f2n l\u1ea1i m\u1ed9t s\u1ed1 c\u00e2y c\u00f3 ch\u1ea5t \u0111\u1ed9c c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i v\u00e0 ph\u00e1t tri\u1ec3n \u0111\u01b0\u1ee3c. S\u1ed1 c\u00e2y n\u00e0y nhanh ch\u00f3ng ph\u00e1t tri\u1ec3n th\u00e0nh qu\u1ea7n th\u1ec3 c\u00e2y tr\u1ed3ng kh\u00e1ng s\u00e2u n\u1ebfu \u00e1p l\u1ef1c ch\u1ecdn l\u1ecdc ng\u00e0y m\u1ed9t t\u0103ng.<\/p>\n
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B\u00e0i 3 (trang 122 SGK Sinh h\u1ecdc 12):\u00a0T\u1ea1i sao c\u00e1c lo\u00e0i n\u1ea5m \u0111\u1ed9c l\u1ea1i th\u01b0\u1eddng c\u00f3 m\u00e0u s\u1eafc s\u1eb7c s\u1ee1?<\/strong><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
M\u00e0u s\u1eafc s\u1eb7c s\u1ee1 c\u1ee7a n\u1ea5m \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 m\u00e0u s\u1eafc “c\u1ea3nh b\u00e1o”. \u0110\u00e2y l\u00e0 m\u1ed9t \u0111\u1eb7c \u0111i\u1ec3m th\u00edch nghi v\u00ec n\u00f3 “c\u1ea3nh b\u00e1o” cho c\u00e1c \u0111\u1ed9ng v\u1eadt \u0103n n\u1ea5m l\u00e0 ch\u00fang ch\u1ee9a ch\u1ea5t \u0111\u1ed9c. Th\u1ef1c t\u1ebf, khi \u0111\u1ed9ng v\u1eadt \u0103n ph\u1ea3i n\u1ea5m \u0111\u1ed9c c\u00f3 m\u00e0u s\u1eafc s\u1eb7c s\u1ee1 th\u00ec sau \u0111\u00f3 nh\u00ecn th\u1ea5y n\u1ea5m c\u00f3 m\u00e0u s\u1eafc s\u1eb7c s\u1ee1 s\u1ebd kh\u00f4ng d\u00e1m \u0103n.<\/p>\n
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B\u00e0i 4 (trang 122 SGK Sinh h\u1ecdc 12):\u00a0M\u1ed9t s\u1ed1 lo\u00e0i sinh v\u1eadt c\u00f3 c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m gi\u1ed1ng c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m th\u00edch nghi c\u1ee7a lo\u00e0i sinh v\u1eadt kh\u00e1c, ng\u01b0\u1eddi ta c\u00f2n g\u1ecdi \u0111\u00f3 l\u00e0 c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m “b\u1eaft ch\u01b0\u1edbc”. V\u00ed d\u1ee5, m\u1ed9t s\u1ed1 lo\u00e0i c\u00f4n tr\u00f9ng kh\u00f4ng c\u00f3 ch\u1ea5t \u0111\u1ed9c l\u1ea1i c\u00f3 m\u00e0u s\u1eafc s\u1eb7c s\u1ee1 gi\u1ed1ng m\u00e0u s\u1eafc c\u1ee7a lo\u00e0i c\u00f4n tr\u00f9ng c\u00f3 ch\u1ee9a ch\u1ea5t \u0111\u1ed9c. \u0110\u1eb7c \u0111i\u1ec3m b\u1eaft ch\u01b0\u1edbc \u0111\u00f3 \u0111em l\u1ea1i gi\u00e1 tr\u1ecb th\u00edch nghi nh\u01b0 th\u1ebf n\u00e0o \u0111\u1ed1i v\u1edbi lo\u00e0i c\u00f4n tr\u00f9ng kh\u00f4ng c\u00f3 ch\u1ea5t \u0111\u1ed9c t\u1ef1 v\u1ec7?<\/strong><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
Nh\u1eefng lo\u00e0i c\u00f4n tr\u00f9ng \u0111\u1ed9c (s\u00e2u r\u00f3m, b\u1ecd n\u00e9t\u2026) th\u01b0\u1eddng c\u00f3 m\u00e0u s\u1eafc s\u1eb7c s\u1ee1 g\u1ecdi l\u00e0 m\u00e0u s\u1eafc “c\u1ea3nh b\u00e1o” khi\u1ebfn cho c\u00e1c sinh v\u1eadt kh\u00e1c kh\u00f4ng d\u00e1m \u0103n ch\u00fang. C\u00e1c lo\u00e0i kh\u00e1c s\u1ed1ng c\u00f9ng v\u1edbi lo\u00e0i c\u00f4n tr\u00f9ng \u0111\u1ed9c n\u00e0y n\u1ebfu c\u00f3 \u0111\u1ed9t bi\u1ebfn l\u00e0m cho c\u00e1 th\u1ec3 c\u00f3 m\u00e0u s\u1eafc s\u1eb7c s\u1ee1 gi\u1ed1ng m\u00e0u c\u1ee7a c\u00f4n tr\u00f9ng \u0111\u1ed9c th\u00ec c\u00e1 th\u1ec3 \u0111\u00f3 c\u0169ng \u0111\u01b0\u1ee3c l\u1ee3i v\u00ec c\u00e1c lo\u00e0i thi\u00ean d\u1ecbch c\u1ee7a ch\u00fang t\u01b0\u1edfng \u0111\u00e2y l\u00e0 lo\u00e0i \u0111\u1ed9c s\u1ebd kh\u00f4ng d\u00e1m \u0103n m\u1eb7c d\u00f9 nh\u1eefng sinh v\u1eadt n\u00e0y: kh\u00f4ng ch\u1ee9a ch\u1ea5t \u0111\u1ed9c.<\/p>\n
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B\u00e0i 5 (trang 122 SGK Sinh h\u1ecdc 12):\u00a0T\u1ea1i sao l\u00fac \u0111\u1ea7u ta d\u00f9ng m\u1ed9t lo\u1ea1i ho\u00e1 ch\u1ea5t th\u00ec di\u1ec7t \u0111\u01b0\u1ee3c t\u1edbi 90% s\u00e2u t\u01a1 h\u1ea1i b\u1eafp c\u1ea3i nh\u01b0ng sau nhi\u1ec1u l\u1ea7n phun thu\u1ed1c th\u00ec hi\u1ec7u qu\u1ea3 di\u1ec7t s\u00e2u c\u1ee7a thu\u1ed1c di\u1ec7t l\u1ea1i gi\u1ea3m d\u1ea7n?<\/strong><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
Khi s\u1eed d\u1ee5ng h\u00f3a ch\u1ea5t c\u00f3 th\u1ec3 g\u00e2y \u0111\u1ed9t bi\u1ebfn, t\u1ea1o gen kh\u00e1ng thu\u1ed1c \u1edf s\u00e2u. D\u01b0\u1edbi t\u00e1c \u0111\u1ed9ng c\u1ee7a ch\u1ecdn l\u1ecdc t\u1ef1 nhi\u00ean, c\u00e1c gen kh\u00e1ng thu\u1ed1c \u0111\u01b0\u1ee3c t\u00edch lu\u1ef9 ng\u00e0y c\u00e0ng nhi\u1ec1u trong c\u01a1 th\u1ec3, cho \u0111\u1ebfn l\u00fac kh\u1ea3 n\u0103ng kh\u00e1ng thu\u1ed1c ng\u00e0y c\u00e0ng ho\u00e0n thi\u1ec7n. \u0110\u00f3 ch\u00ednh l\u00e0 s\u1ef1 h\u00ecnh th\u00e0nh \u0111\u1eb7c \u0111i\u1ec3m th\u00edch nghi c\u1ee7a s\u00e2u tr\u01b0\u1edbc c\u00e1c t\u00e1c \u0111\u1ed9ng c\u1ee7a m\u00f4i tr\u01b0\u1eddng.<\/p>\n
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B\u00e0i 1 (trang 122 SGK Sinh h\u1ecdc 12):\u00a0H\u00e3y s\u01b0u t\u1eadp c\u00e1c h\u00ecnh \u1ea3nh v\u1ec1 c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m th\u00edch nghi v\u00e0 gi\u1ea3i th\u00edch \u0111\u1eb7c \u0111i\u1ec3m \u0111\u00f3 \u0111em l\u1ea1i gi\u00e1 tr\u1ecb th\u00edch nghi nh\u01b0 th\u1ebf n\u00e0o \u0111\u1ed1i v\u1edbi sinh v\u1eadt \u0111\u00f3. L\u1eddi gi\u1ea3i: \u00a0 \u00a0 \u00a0C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m th\u00edch nghi c\u1ee7a t\u1eebng lo\u00e0i sinh v\u1eadt trong c\u00e1c […]<\/p>\n","protected":false},"author":3,"featured_media":22674,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[1307],"tags":[1397,1398],"yoast_head":"\n
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