Cov txheej txheem:
Video: Dab tsi yog qhov feem ntau yuav ua rau kev xaiv kev taw qhia?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Kev taw qhia kev xaiv tshwm sim feem ntau feem ntau nyob rau hauv ib puag ncig kev hloov pauv thiab thaum cov neeg tsiv teb tsaws chaw mus rau thaj chaw tshiab nrog kev sib txawv ntawm ib puag ncig. Kev taw qhia kev xaiv tso cai rau kev hloov pauv sai hauv allele zaus, thiab ua lub luag haujlwm tseem ceeb hauv speciation.
Ua raws li qhov no hauv kev txiav txim siab, qhov kev xaiv taw qhia txhais li cas?
Kev taw qhia kev xaiv yog hom ntuj xaiv nyob rau hauv uas cov phenotype (cov yam ntxwv soj ntsuam) ntawm cov tsiaj nyhav mus rau ib tug heev theej txhais tau tias phenotype los yog opposite heev phenotype.
Kuj Paub, qhov txawv ntawm kev cuam tshuam thiab kev xaiv kev taw qhia yog dab tsi? Kev taw qhia kev xaiv tau piav raws li qhov xaiv rau ib qho tshwj xeeb phenotype hauv pejxeem as opposed to the other phenotypes. Kev xaiv cuam tshuam yog thaum cov pejxeem muaj xaiv pressures ua raws li nws uas xaiv tawm tsam qhov nruab nrab phenotypes thiab huab phenotypes yog xaiv rau.
Ib yam li ntawd, tej zaum koj yuav nug, cov piv txwv ntawm kev cuam tshuam kev xaiv yog dab tsi?
Kev cuam tshuam kev xaiv piv txwv: Xim
- Peppered npauj: Ib qho piv txwv ntawm kev tshawb fawb tshaj plaws ntawm kev cuam tshuam kev xaiv yog rooj plaub ntawm ?London's peppered npauj.
- Oysters: Lub teeb- thiab xim tsaus nti tuaj yeem muaj qhov zoo nkauj zoo nkauj uas tsis yog lawv cov txheeb ze xim nruab nrab.
Vim li cas thiaj xaiv qhov ruaj khov tshaj plaws?
Qhov no txhais tau tias feem ntau phenotype nyob rau hauv cov pejxeem yog xaiv rau thiab tseem yuav kav rau tiam tom ntej. Vim feem ntau Cov yam ntxwv hloov me ntsis raws sijhawm, ruaj khov xaiv xav tias yog tus feem ntau hom ntawm xaiv hauv feem ntau cov pejxeem.
Pom zoo:
Dab tsi yog qhov txawv ntawm kev xaiv kev taw qhia thiab kev xaiv cuam tshuam?
Hauv kev xaiv cov kev taw qhia, cov pej xeem cov noob caj noob ces hloov mus rau qhov tshiab phenotype thaum raug kev hloov pauv ib puag ncig. Hauv kev sib txawv lossis kev cuam tshuam kev xaiv, qhov nruab nrab lossis nruab nrab phenotypes feem ntau tsis haum dua li qhov phenotype huab cua thiab tsis zoo li yuav ua rau muaj txiaj ntsig zoo hauv cov pej xeem
Qhov twg yog qhov zoo dua qhov kev xaiv ntuj los yog kev xaiv dag Yog vim li cas?
Thaum lub sij hawm xaiv ntuj, hom ciaj sia thiab kev yug me nyuam txiav txim siab cov yam ntxwv. Txawm hais tias tib neeg tuaj yeem txhim kho lossis ua rau lub cev muaj peev xwm los ntawm kev xaiv kev yug me nyuam, qhov xwm txheej cuam tshuam nws tus kheej nrog cov yam ntxwv uas tso cai rau qhov zoo rau cov tsiaj muaj peev xwm ua phooj ywg thiab muaj sia nyob
Nyob rau hauv dab tsi kev taw qhia yog qhov siab tshaj plaws ntawm kev nce?
Qhov siab tshaj plaws ntawm kev hloov pauv yog li ntawd thiab tshwm sim nyob rau hauv cov kev taw qhia ntawm gradient, $ abla f(2, 0) = (0, 2)$, thiab qhov tsawg kawg nkaus tus nqi ntawm kev hloov yog thiab tshwm sim nyob rau hauv cov kev taw qhia opposite ntawm lub gradient, uas. yog $- abla f(2, 0) = (0, -2)$. Yog li ntawd
Dab tsi yog lub ntsiab lus ntawm kev taw qhia kev xaiv?
Hauv cov noob caj noob ces, kev xaiv cov kev taw qhia yog ib hom kev xaiv ntuj uas ib qho phenotypes nyiam tshaj lwm cov phenotypes, ua rau cov zaus allele hloov mus rau lub sijhawm ntawm cov phenotype
Dab tsi yog qhov yuam kev loj tshaj plaws yog tias Irina ntsuas qhov ntev ntawm nws lub qhov rais li 3.35 feet qhov yuam kev loj tshaj plaws yog taw?
Kev daws: Qhov yuam kev loj tshaj plaws hauv kev ntsuas ntsuas tau txhais tias yog ib nrab ntawm qhov ntsuas ntsuas