Combinatorial, mutational thiab kev hloov kho variability

Kev hloov kho variability - nws yog heev tseem ceeb cov khoom teejtug uas tus kab mob no kom hloov mus rau lwm cheeb tsam. Cov teeb no txoj kev tshua, uas yog cov muaj sia adaptation ntawm lub cev los yog rau tag nrho cov pejxeem mus rau ib tug kev hloov nyob rau hauv ib puag ncig tej yam kev mob. Piv txwv li, lub hnub daim tawv nqaij yog ntau dua los yog tsawg tsaus ntawm txhua tus neeg.

Kev hloov kho variability thiab nws cov khoom

Qhov no cov khoom teejtug uas tus kab mob no muaj ib co yam ntxwv ntawm tus nta:

• Kev hloov kho variability muaj feem xyuam rau tsuas yog tus phenotype (lwm nta), tab sis muaj tsis ntxim rau cov genotype (genetic cov ntaub ntawv ntawm ib tug neeg teeb).
• Nws yog ib lub xwm ntawm cov pab pawg neeg - yog hais tias ib co ib puag ncig tej yam kev mob cuam tshuam cov pab pawg neeg ntawm cov kab mob, ces tag nrho nws cov neeg sawv cev cai cov tsos ntawm cov mob ib yam nkaus.
• Reversibility - kev hloov tshwm sim nyob rau hauv qhov tus ntawm tej yam tseem ceeb. Yog hais tias ib tug hloov lwm lub tsev lub cev lwm tej yam kev mob los yog tshem tawm hauv cov nyhuv ntawm yam uas hloov lub phenotypic ploj.
• Cov kev hloov uas tshwm sim nyob rau hauv tus ntawm lwm yam, yuav tsis pub.

Nws yuav tsum tau muab sau tseg tias cov kev hloov kho variability yog tseem ceeb heev rau tus txheej txheem ntawm tej yam ntuj tso xaiv. Qhov tseeb hais tias nyob rau hauv cov xwm ciaj sia cov neeg muaj tus kab mob uas yog feem ntau suited rau cov tej yam kev mob, tshwj xeeb tshaj yog cov cia li hloov nyob rau hauv lwm yam. Combinatorial thiab mutational variability yog tsis tau kiag li muab lub cev nrog rau lub peev xwm hloov.

Kev hloov kho variability: piv txwv

Nyob rau hauv cov xwm, ib tug yuav nrhiav suav tsis tau piv txwv ntawm cov kev pauv nyob rau hauv lub kab. Hauv qab no yog teev tseg feem ntau.

• Thaum tus sawv nyob rau hauv lub roob, qhov chaw uas cov ib puag ncig tej yam kev mob hloov, nyob rau hauv tib neeg los yog tsiaj txhu cov ntshav ntawm ib qho kev nce rau hauv lub xov tooj ntawm cov ntshav liab, uas ib txwm oxygen mov.
• Thaum raug rau ultraviolet rays nce nyiaj pib xim nyob rau hauv daim tawv nqaij ntaub so ntswg.
• Raws li ib tug tshwm sim, cov mob siab heev ce nqaij loj heev muaj zog. Tom qab txiav ntawm kev ua hauj lwm rau hauv lub cev maj mam loses nws elasticity thiab cov nqaij ntshiv txo nyob rau hauv loj.
• Yog hais tias cov dawb Himalayan luav txav nyob rau hauv ntsis climatic tej yam kev mob thiab lub shaved cheeb tsam ntawm lub cev, tus tshiab cov plaub hau yuav tsum grey.
• Yog hais tias cov ntoo twb siab txhab nplooj, thiab thaum hmo ntuj lawv yuav muaj cuam tshuam los ntawm kub hauv qab no zero, nyob rau hauv thaum sawv ntxov koj yuav pom ib tug txawv reddish Hawj txawm.

Nyob rau hauv thiaj li yuav to taub lub ntsiab ntawm kev hloov kho kiag li lawm, nws yog tsim nyog los xav txog lwm cov ntaub ntawv ntawm variability.

combinatorial variability

Tej variability yog ib tug ntawm cov recombination ntawm noob nyob rau hauv gametes sib tshuam uake. Tam sim no xav txog ib qho piv txwv: Yog hais tias tus me nyuam tus txiv ntsuab lub qhov muag thiab plaub hau dub, thiab nws niam - daj hau thiab xiav ob lub qhov muag. Ib tug me nyuam tej zaum yuav yug nyob rau hauv ib tug ntsuab lub qhov muag thiab daj hau los yog cov plaub hau dub thiab xiav ob lub qhov muag. Nws yog ib cov phenotypic hloov yog muab los ntawm combinatorial variability ntawm offspring.

mutational variability

Cov kev hloov tshwm sim nyob rau hauv lub raug ntawm lub cev ntawm mutagens tshuaj, lub cev los yog biological xwm. Mutational variability tsis zoo li kev hloov kho:

• Nws tshwm sim nthawv, thiab nws yog suab tsis yooj yim sua twv seb;
• Nws ua rau kev hloov nyob rau hauv lub caj khoom;
• mutational hloov resistant thiab pub;
• change yuav tsum yog benign los yog ua kab mob los yog kev tuag;
• lawv tsis yog nyob ntawm seb cov ib puag ncig tej yam kev mob;
• tshwm sim nyob rau hauv ib co neeg;

Raws li koj tau pom, lub variability - nws yog ib tug heev cov txheej txheem uas yuav ob lub genotype thiab phenotype yam ntxwv. Nws yog vim kev hloov kho, ob peb ua ke thiab change ntawm cov kab mob no maj hloov, kev txhim kho thiab adapting rau cov kev pauv.