Cov txheej txheem:
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
luam ntawv . [ĭm'prĭn'tĭng] Ib txoj kev kawm sai sai uas tus menyuam yug los lossis tus tsiaj hluas heev tsim kom muaj tus cwj pwm ntawm kev lees paub thiab kev nyiam rau lwm tus tsiaj ntawm nws tus kheej, nrog rau cov tib neeg ntawm nws hom, xws li nws niam nws txiv, los yog hloov rau cov no.
Xav txog qhov no, imprinting muab piv txwv li cas?
Lwm yam tsiaj uas imprint muaj xws li qaib thiab geese. Zaj movie Fly Away Home yog hais txog luam ntawv . Kev sib deev luam ntawv , thaum ib tug tsiaj kawm paub qhov txawv ntawm tus khub zoo li cas kom tsis txhob muaj kev yug me nyuam, tshwm sim hauv tshis, zebra finches, thiab pandas.
Tsis tas li ntawd, dab tsi tsiaj imprint rau tib neeg? Xws li hom muaj xws li ducks thiab lwm yam dej fowl, nrog rau qaib thiab qaib ntxhw . Imprinting kuj zoo nkaus li muaj nyob rau hauv qee hom tsiaj tsiaj, xws li guinea npua (Hess 1959a; Shipley 1963). Nyob rau hauv tag nrho cov no qhov txuas ntawm cov tub ntxhais hluas rau leej niam yog tshwm sim thaum nws ua raws li nws txog.
Kuj kom paub, koj siv imprint hauv kab lus li cas?
imprinted kab lus Piv txwv
- Nws kaw nws ob lub qhov muag, savoring cov kev xav, nws cov ntxhiab thiab rhuab kov imprinted rau nws lub siab.
- Luam tawm ntawm London los ntawm Robert Barker, Lub Tshuab Luam Ntawv rau Vaj Ntxwv Maiestie zoo tshaj plaws.
- Txawm hais tias lawv tau ua ke tab sis ib nrab hnub, txhua tus nyob nrog nws, indelibly imprinted nyob rau hauv nws nco.
Yuav ua li cas imprinting tshwm sim?
Imprinting tshwm sim los ntawm ib tug qauv ntawm methylation, txhais tau tias cov ntawv luam ntawm cov noob yuav tsum tau inactivated yog coated nrog methyl pawg. Qhov no tshwm sim ua ntej fertilization, nyob rau hauv lub qe thiab phev hlwb. Cov tshuaj methylation tiv thaiv cov noob no los ntawm kev nthuav tawm. Piv txwv li, Jane tau txais ob daim ntawv luam ntawm tus txiv neej imprinted noob.
Pom zoo:
Vim li cas kev lag luam tshuaj suav hais tias yog kev lag luam yooj yim?
Kev lag luam tshuaj siv cov khoom siv raw los tsim cov khoom lag luam qhia cov kua qaub, hauv paus, alkali thiab ntsev. Cov khoom siv feem ntau yog siv rau hauv kev tsim khoom ntawm lwm cov khoom lag luam xws li iav, chiv, roj hmab, tawv, ntawv thiab textiles. Yog li, peb tuaj yeem hais tias kev lag luam tshuaj lom neeg yog kev lag luam yooj yim
Vim li cas qhov kev tawg ntawm daim ntawv thiab hlawv cov ntawv suav tias yog ob hom kev hloov pauv?
Tearing ntawm daim ntawv yog ib qho kev hloov ntawm lub cev vim hais tias thaum daim ntawv torn tsuas yog cov tsos ntawm daim ntawv hloov thiab tsis muaj cov khoom tshiab tsim. tearing ntawm daim ntawv yog ib qho kev hloov ntawm lub cev vim nws tseem zoo li qub tab sis qhov kub ntawm daim ntawv yog ib qho tshuaj hloov vim nws hloov mus rau hauv tshauv
Txoj kev faib cov ntaub ntawv twg muab cov ntaub ntawv sib npaug ntawm cov ntaub ntawv lossis cov kev tshuaj xyuas hauv txhua chav kawm cov ntaub ntawv?
Quantile. txhua chav kawm muaj cov yam ntxwv sib npaug. Ib qho kev faib tawm ntau yog zoo haum rau cov ntaub ntawv faib tawm. Quantile muab tib tus lej ntawm cov ntaub ntawv muaj nuj nqis rau txhua chav kawm
Vim li cas thiaj muaj kev lag luam thiab kev ua lag luam?
Ua thiab lagging strands coli, DNA polymerase uas tswj feem ntau ntawm cov synthesis yog DNA polymerase III. Cov strand no yog ua tsis tu ncua, vim hais tias DNA polymerase yog txav mus rau tib qho kev taw qhia raws li cov diav rawg replication. Qhov no tsis tu ncua synthesized strand yog hu ua tus thawj strand
Cov txheej txheem dab tsi uas tus kws tshawb fawb siv los tsim ntau cov ntawv luam ntawm DNA xav tau sau rau hauv daim ntawv dawb paug 1?
Molecular Cloning. Cloning tso cai rau tsim ntau cov ntawv luam ntawm cov noob, qhia cov noob, thiab kawm txog cov noob tshwj xeeb. Yuav kom tau txais cov DNA tawg rau hauv cov kab mob hauv cov kab mob hauv daim ntawv uas yuav tau theej lossis nthuav tawm, cov khoom tawg yog thawj zaug tso rau hauv plasmid