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{"id":22713,"date":"2018-03-20T15:27:35","date_gmt":"2018-03-20T08:27:35","guid":{"rendered":"https:\/\/lop12.edu.vn\/?p=22713"},"modified":"2018-03-20T15:28:00","modified_gmt":"2018-03-20T08:28:00","slug":"phan-nam-chuong-5-bai-23-on-tap-phan-di-truyen-hoc","status":"publish","type":"post","link":"https:\/\/lop12.edu.vn\/phan-nam-chuong-5-bai-23-on-tap-phan-di-truyen-hoc\/","title":{"rendered":"Ph\u1ea7n N\u0103m – Ch\u01b0\u01a1ng 5 – B\u00e0i 23: \u00d4n t\u1eadp ph\u1ea7n di truy\u1ec1n h\u1ecdc"},"content":{"rendered":"

B\u00e0i 1 (trang 102 SGK Sinh h\u1ecdc 12):\u00a0H\u00e3y \u0111i\u1ec1n c\u00e1c ch\u00fa th\u00edch th\u00edch h\u1ee3p v\u00e0o b\u00ean c\u1ea1nh c\u00e1c m\u0169i t\u00ean n\u00eau trong s\u01a1 \u0111\u1ed3 d\u01b0\u1edbi \u0111\u00e2y \u0111\u1ec3 minh ho\u1ea1 qu\u00e1 tr\u00ecnh di truy\u1ec1n \u1edf m\u1ee9c \u0111\u1ed9 ph\u00e2n t\u1eed:<\/strong><\/p>\n

\"\"<\/p>\n

L\u1eddi gi\u1ea3i<\/strong><\/p>\n

\"\"<\/p>\n

B\u00e0i 2 (trang 102 SGK Sinh h\u1ecdc 12):\u00a0T\u1ea1i sao trong qu\u00e1 tr\u00ecnh nh\u00e2n \u0111\u00f4i, m\u1ed7i m\u1ea1ch c\u1ee7a ph\u00e2n t\u1eed ADN l\u1ea1i \u0111\u01b0\u1ee3c t\u1ed5ng h\u1ee3p theo m\u1ed9t c\u00e1ch kh\u00e1c nhau?<\/strong><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

Do c\u1ea5u tr\u00fac ph\u00e2n t\u1eed ADN c\u00f3 2 m\u1ea1ch p\u00f4linucl\u00ea\u00f4tit \u0111\u1ed1i song song<\/p>\n

\"\"<\/p>\n

, enzim p\u00f4limeraza ch\u1ec9 t\u1ed5ng h\u1ee3p m\u1ea1ch m\u1edbi theo chi\u1ec1u 5′ \u2192 3′. N\u00ean m\u1ed7i m\u1ea1ch c\u1ee7a ph\u00e2n t\u1eed ADN \u0111\u01b0\u1ee3c t\u1ed5ng h\u1ee3p theo m\u1ed9t c\u00e1ch kh\u00e1c nhau (m\u1ea1ch khu\u00e2n chi\u1ec1u 3\u2019 \u2192 5\u2019 \u0111\u01b0\u1ee3c t\u1ed5ng h\u1ee3p li\u00ean t\u1ee5c, c\u00f2n m\u1ea1ch khu\u00e2n 5\u2019 \u2192 3\u2019\u0111\u01b0\u1ee3c t\u1ed5ng h\u1ee3p ng\u1eaft qu\u00e3ng t\u1ea1o c\u00e1c \u0111o\u1ea1n Okazaki).<\/p>\n

B\u00e0i 3 (trang 102 SGK Sinh h\u1ecdc 12):\u00a0H\u00e3y gi\u1ea3i th\u00edch c\u00e1ch th\u1ee9c ph\u00e2n lo\u1ea1i bi\u1ebfn d\u1ecb \u0111\u01b0\u1ee3c n\u00eau trong b\u00e0i v\u00e0 cho bi\u1ebft \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a t\u1eebng lo\u1ea1i.<\/strong><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

* C\u00f3 hai lo\u1ea1i bi\u1ebfn d\u1ecb \u0111\u00f3 l\u00e0 bi\u1ebfn d\u1ecb di truy\u1ec1n v\u00e0 bi\u1ebfn d\u1ecb kh\u00f4ng di truy\u1ec1n \u0111\u01b0\u1ee3c chia d\u1ef1a v\u00e0o kh\u1ea3 n\u0103ng di truy\u1ec1n cho th\u1ebf h\u1ec7 sau.<\/p>\n

– Bi\u1ebfn d\u1ecb di truy\u1ec1n l\u00e0 nh\u1eefng bi\u1ebfn \u0111\u1ed5i trong v\u1eadt ch\u1ea5t di truy\u1ec1n (ADN) n\u00ean di truy\u1ec1n \u0111\u01b0\u1ee3c. Bi\u1ebfn d\u1ecb di truy\u1ec1n g\u1ed3m:<\/p>\n

\"\"<\/p>\n

– Bi\u1ebfn d\u1ecb kh\u00f4ng di truy\u1ec1n l\u00e0 nh\u1eefng bi\u1ebfn \u0111\u1ed5i ki\u1ec3u h\u00ecnh d\u01b0\u1edbi t\u00e1c \u0111\u1ed9ng c\u1ee7a \u0111i\u1ec1u ki\u1ec7n s\u1ed1ng, kh\u00f4ng bi\u1ebfn \u0111\u1ed5i trong v\u1eadt ch\u1ea5t di truy\u1ec1n (ADN) n\u00ean kh\u00f4ng di truy\u1ec1n \u0111\u01b0\u1ee3c. \u0110\u00f3 l\u00e0 th\u01b0\u1eddng bi\u1ebfn.<\/p>\n

* \u0110\u1eb7c \u0111i\u1ec3m c\u1ee7a t\u1eebng lo\u1ea1i:<\/p>\n

– \u0110\u1ed9t bi\u1ebfn: l\u00e0 nh\u1eefng bi\u1ebfn \u0111\u1ed5i trong v\u1eadt ch\u1ea5t di truy\u1ec3n, cung c\u1ea5p ngu\u1ed3n nguy\u00ean li\u1ec7u cho qu\u00e1 tr\u00ecnh t\u1ea1o gi\u1ed1ng v\u00e0 ti\u1ebfn h\u00f3a.<\/p>\n

+ \u0110\u1ed9t bi\u1ebfn gen: L\u00e0 nh\u1eefng bi\u1ebfn \u0111\u1ed5i trong c\u1ea5u tr\u00fac c\u1ee7a gen li\u00ean quan t\u1edbi m\u1ed9t ho\u1eb7c m\u1ed9t s\u1ed1 c\u1eb7p nucl\u00ea\u00f4tit. \u0110\u1ed9t bi\u1ebfn gen bao g\u1ed3m \u0111\u1ed9t bi\u1ebfn thay th\u1ebf, th\u00eam hay m\u1ea5t m\u1ed9t c\u1eb7p nucl\u00ea\u00f4tit.<\/p>\n

+ \u0110\u1ed9t bi\u1ebfn NST: nh\u1eefng bi\u1ebfn \u0111\u1ed5i trong c\u1ea5u tr\u00fac NST, bao g\u1ed3m \u0111\u1ed9t bi\u1ebfn c\u1ea5u tr\u00fac NST v\u00e0 \u0111\u1ed9t bi\u1ebfn s\u1ed1 l\u01b0\u1ee3ng NST.<\/p>\n

\u2022 \u0110\u1ed9t bi\u1ebfn c\u1ea5u tr\u00fac NST c\u00f3 4 d\u1ea1ng: m\u1ea5t \u0111o\u1ea1n NST, l\u1eb7p \u0111o\u1ea1n NST, \u0111\u1ea3o \u0111o\u1ea1n NST, chuy\u1ec3n \u0111o\u1ea1n NST.<\/p>\n

\u2022 \u0110\u1ed9t bi\u1ebfn s\u1ed1 l\u01b0\u1ee3ng NST g\u1ed3m: \u0111\u1ed9t bi\u1ebfn l\u1ec7ch b\u1ed9i (th\u1ec3 kh\u00f4ng, th\u1ec3 m\u1ed9t, th\u1ec3 ba\u2026) v\u00e0 \u0111\u1ed9t bi\u1ebfn \u0111a b\u1ed9i (\u0111a b\u1ed9i ch\u1eafn v\u00e0 \u0111a b\u1ed9i l\u1ebb)<\/p>\n

– Th\u01b0\u1eddng bi\u1ebfn: nh\u1eefng bi\u1ebfn \u0111\u1ed5i ki\u1ec3u h\u00ecnh c\u1ee7a c\u00f9ng m\u1ed9t ki\u1ec3u gen do s\u1ef1 thay \u0111\u1ed5i c\u1ee7a m\u00f4i tr\u01b0\u1eddng s\u1ed1ng. V\u1eadn d\u1ee5ng nh\u1eefng hi\u1ec3u bi\u1ebft v\u1ec1 \u1ea3nh h\u01b0\u1edfng c\u1ee7a m\u00f4i tr\u01b0\u1eddng \u0111\u1ed1i v\u1edbi t\u00ednh tr\u1ea1ng s\u1ed1 l\u01b0\u1ee3ng, v\u1ec1 m\u1ee9c ph\u1ea3n \u1ee9ng \u0111\u1ec3 n\u00e2ng cao n\u0103ng su\u1ea5t c\u00e2y tr\u1ed3ng.<\/p>\n

B\u00e0i 4 (trang 102 SGK Sinh h\u1ecdc 12):\u00a0Cho m\u1ed9t c\u00e2y \u0111\u1eadu H\u00e0 Lan c\u00f3 ki\u1ec3u gen d\u1ecb h\u1ee3p t\u1eed v\u1edbi ki\u1ec3u h\u00ecnh hoa \u0111\u1ecf t\u1ef1 th\u1ee5 ph\u1ea5n. \u1ede \u0111\u1eddi sau, ng\u01b0\u1eddi ta l\u1ea5y ng\u1eabu nhi\u00ean 5 h\u1ea1t \u0111em gieo. X\u00e1c su\u1ea5t \u0111\u1ec3 c\u1ea3 5 h\u1ea1t cho ra c\u1ea3 5 c\u00e2y \u0111\u1ec1u c\u00f3 hoa tr\u1eafng l\u00e0 bao nhi\u00eau? X\u00e1c xu\u1ea5t \u0111\u1ec3 trong s\u1ed1 5 c\u00e2y con c\u00f3 \u00edt nh\u1ea5t m\u1ed9t c\u00e2y hoa m\u00e0u \u0111\u1ecf l\u00e0 bao nhi\u00eau?<\/strong><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

X\u00e1c su\u1ea5t \u0111\u1ec3 5 h\u1ea1t \u0111\u1ec1u cho c\u00e2y hoa tr\u1eafng l\u00e0 (1\/4)5<\/sup>. \u0110\u1ec3 t\u00ecm x\u00e1c su\u1ea5t trong s\u1ed1 5 c\u00e2y \u00edt nh\u1ea5t c\u00f3 m\u1ed9t c\u00e2y hoa \u0111\u1ecf ta ch\u1ec9 c\u1ea7n l\u1ea5y 1- (x\u00e1c su\u1ea5t \u0111\u1ec3 5 c\u00e2y cho hoa tr\u1eafng) = 1- (1\/4)5<\/sup>.<\/p>\n

B\u00e0i 5 (trang 102 SGK Sinh h\u1ecdc 12):\u00a0M\u1ed9t s\u1ed1 c\u1eb7p v\u1ee3 ch\u1ed3ng b\u00ecnh th\u01b0\u1eddng sinh ra ng\u01b0\u1eddi con b\u1ecb b\u1ec7nh b\u1ea1ch t\u1ea1ng. T\u1ec9 l\u1ec7 ng\u01b0\u1eddi con b\u1ecb b\u1ec7nh b\u1ea1ch t\u1ea1ng chi\u1ebfm kho\u1ea3ng 25% t\u1ed5ng s\u1ed1 con c\u1ee7a c\u00e1c c\u1eb7p v\u1ee3 ch\u1ed3ng n\u00e0y. Nh\u1eefng ng\u01b0\u1eddi b\u1ecb b\u1ec7nh b\u1ea1ch t\u1ea1ng l\u1ea5y nhau th\u01b0\u1eddng sinh ra 100% s\u1ed1 con b\u1ecb b\u1ec7nh b\u1ea1ch t\u1ea1ng. Tuy nhi\u00ean, trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p, hai v\u1ee3 ch\u1ed3ng c\u00f9ng b\u1ecb b\u1ec7nh b\u1ea1ch t\u1ea1ng l\u1ea5y nhau l\u1ea1i sinh ra ng\u01b0\u1eddi con b\u00ecnh th\u01b0\u1eddng. H\u00e3y gi\u1ea3i th\u00edch c\u01a1 s\u1edf di truy\u1ec1n h\u1ecdc c\u00f3 th\u1ec3 c\u00f3 c\u1ee7a hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y.<\/strong><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

Hai v\u1ee3 ch\u1ed3ng c\u00f9ng b\u1ecb b\u1ec7nh b\u1ea1ch t\u1ea1ng m\u00e0 l\u1ea1i sinh ra con ng\u01b0\u1eddi b\u00ecnh th\u01b0\u1eddng th\u00ec ta c\u00f3 th\u1ec3 gi\u1ea3i th\u00edch \u0111\u00f3 l\u00e0 tr\u01b0\u1eddng h\u1ee3p k\u1ebft h\u1ee3p alen g\u00e2y b\u1ec7nh b\u1ea1ch t\u1ea1ng \u1edf m\u1eb9 thu\u1ed9c m\u1ed9t gen kh\u00e1c v\u1edbi gen g\u00e2y b\u1ec7nh b\u1ea1ch t\u1ea1ng \u1edf b\u1ed1. Do c\u00f3 s\u1ef1 t\u01b0\u01a1ng t\u00e1c gen n\u00ean \u1edf ng\u01b0\u1eddi con \u0111\u00e3 c\u00f3 m\u00e0u da b\u00ecnh th\u01b0\u1eddng.<\/p>\n

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B\u00e0i 6 (trang 102 SGK Sinh h\u1ecdc 12):\u00a0T\u1ea1i sao b\u1ec7nh di truy\u1ec1n do gen l\u1eb7n li\u00ean k\u1ebft v\u1edbi NST gi\u1edbi t\u00ednh X \u1edf ng\u01b0\u1eddi l\u1ea1i d\u1ec5 \u0111\u01b0\u1ee3c ph\u00e1t hi\u1ec7n h\u01a1n so v\u1edbi b\u1ec7nh do gen l\u1eb7n n\u1eb1m tr\u00ean NST th\u01b0\u1eddng?<\/strong><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

Gen l\u1eb7n tr\u00ean NST th\u01b0\u1eddng th\u00ec kh\u00f3 ph\u00e1t hi\u1ec7n h\u01a1n so v\u1edbi gen l\u1eb7n tr\u00ean NST X \u1edf ng\u01b0\u1eddi l\u00e0 v\u00ec gen l\u1eb7n tr\u00ean NST th\u01b0\u1eddng ch\u1ec9 \u0111\u01b0\u1ee3c bi\u1ec3u hi\u1ec7n ra ki\u1ec3u h\u00ecnh khi c\u00f3 c\u1ea3 hai alen l\u1eb7n, c\u00f2n gen l\u1eb7n tr\u00ean NST X ch\u1ec9 c\u1ea7n m\u1ed9t alen l\u1eb7n c\u0169ng \u0111\u00e3 bi\u1ec3u hi\u1ec7n ra ki\u1ec3u h\u00ecnh \u1edf nam gi\u1edbi.<\/p>\n

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B\u00e0i 7 (trang 102 SGK Sinh h\u1ecdc 12):\u00a0M\u1ed9t qu\u1ea7n th\u1ec3 khi n\u00e0o th\u00ec \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 c\u00e2n b\u1eb1ng di truy\u1ec1n (c\u00e2n b\u1eb1ng Hac\u0111i- Vanbec)?<\/strong><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

M\u1ed9t qu\u1ea7n th\u1ec3 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 c\u00e2n b\u1eb1ng di truy\u1ec1n khi t\u1ec9 l\u1ec7 c\u00e1c ki\u1ec3u gen tho\u1ea3 m\u00e3n c\u00f4ng th\u1ee9c:<\/p>\n

p2<\/sup>AA + 2pqAa + q2<\/sup>aa = 1<\/p>\n

Trong m\u1ed9t qu\u1ea7n th\u1ec3 l\u1edbn, ng\u1eabu ph\u1ed1i n\u1ebfu kh\u00f4ng c\u00f3 c\u00e1c y\u1ebfu t\u1ed1 l\u00e0m thay \u0111\u1ed5i t\u1ea7n s\u1ed1 alen th\u00ec th\u00e0nh ph\u1ea7n ki\u1ec3u gen c\u1ee7a qu\u1ea7n th\u1ec3 s\u1ebd \u1edf tr\u1ea1ng th\u00e1i c\u00e2n b\u1eb1ng v\u00e0 \u0111\u01b0\u1ee3c duy tr\u00ec kh\u00f4ng \u0111\u1ed5i t\u1eeb th\u1ebf h\u1ec7 n\u00e0y sang th\u1ebf h\u1ec7 kh\u00e1c.<\/p>\n

B\u00e0i 8 (trang 102 SGK Sinh h\u1ecdc 12):\u00a0\u0110\u1ec3 t\u1ea1o gi\u1ed1ng vi sinh v\u1eadt, ng\u01b0\u1eddi ta hay d\u00f9ng bi\u00ean ph\u00e1p g\u00ec? Gi\u1ea3i th\u00edch?<\/strong><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

\u0110\u1ec3 t\u1ea1o gi\u1ed1ng vi sinh v\u1eadt ng\u01b0\u1eddi ta d\u00f9ng ph\u01b0\u01a1ng ph\u00e1p th\u00edch h\u1ee3p nh\u1ea5t l\u00e0 g\u00e2y \u0111\u1ed9t bi\u1ebfn. \u0110\u00e2y l\u00e0 ph\u01b0\u01a1ng ph\u00e1p r\u1ea5t c\u00f3 hi\u1ec7u qu\u1ea3 \u0111\u1ed1i v\u1edbi vi sinh v\u1eadt v\u00ec vi sinh v\u1eadt sinh s\u1ea3n v\u1edbi t\u1ed1c \u0111\u1ed9 r\u1ea5t nhanh n\u00ean ng\u01b0\u1eddi ta d\u1ec5 d\u00e0ng ph\u00e2n l\u1eadp \u0111\u01b0\u1ee3c c\u00e1c d\u00f2ng c\u00f3 ki\u1ec3u h\u00ecnh mong mu\u1ed1n, r\u1ed3i t\u1ea1o d\u00f2ng thu\u1ea7n ch\u1ee7ng.<\/p>\n

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B\u00e0i 9 (trang 102 SGK Sinh h\u1ecdc 12):\u00a0Nh\u1eefng ng\u01b0\u1eddi c\u00f3 b\u1ed9 NST: 44 NST th\u01b0\u1eddng + XXY ho\u1eb7c 44 NST th\u01b0\u1eddng + XXXY \u0111\u1ec1u l\u00e0 nam gi\u1edbi. Nh\u1eefng ng\u01b0\u1eddi c\u00f3 b\u1ed9 NST v\u1edbi 44 NST th\u01b0\u1eddng + X ho\u1eb7c 44 NST th\u01b0\u1eddng + XXX \u0111\u1ec1u l\u00e0 n\u1eef gi\u1edbi. T\u1eeb th\u1ef1c t\u1ebf n\u00e0y ch\u00fang ta c\u00f3 th\u1ec3 r\u00fat ra \u0111\u01b0\u1ee3c k\u1ebft lu\u1eadn g\u00ec?<\/strong><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

T\u1eeb nh\u1eefng ng\u01b0\u1eddi c\u00f3 b\u1ed9 NST b\u1ea5t th\u01b0\u1eddng n\u00eau trong \u0111\u1ec1 b\u00e0i, ta c\u00f3 th\u1ec3 r\u00fat k\u1ebft lu\u1eadn l\u00e0 nhi\u1ec5m s\u1eafc th\u1ec3 Y \u1edf ng\u01b0\u1eddi c\u00f3 vai tr\u00f2 \u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng trong vi\u1ec7c quy \u0111\u1ecbnh nam t\u00ednh. N\u1ebfu c\u00f3 NST Y th\u00ec h\u1ee3p t\u1eed s\u1ebd ph\u00e1t tri\u1ec3n th\u00e0nh con trai c\u00f2n kh\u00f4ng c\u00f3 Y th\u00ec h\u1ee3p t\u1eed ph\u00e1t tri\u1ec3n th\u00e0nh con g\u00e1i.<\/p>\n

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