Video: Dab tsi yog qhov kev hloov pauv nruab nrab?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Tsis Muaj Variation txhais tau hais tias ntau alleles muaj nyob rau ntawm ib tug muab genetic locus vim hais tias cov alleles no distinguishable los ntawm ntuj xaiv.
Ntawm no, dab tsi yog qhov sib txawv nruab nrab ntawm biology?
nruab nrab variation . qhov sib txawv ntawm DNA kab ke uas tsis muaj kev xaiv zoo dua lossis qhov tsis zoo; recessivealleles nyob rau hauv diploid eukaryotes. sib npaug xaiv. tshwm sim thaum kev xaiv ntuj tuav ob lossis ntau daim ntawv hauv apopulation.
Tsis tas li ntawd, dab tsi yog xaiv nruab nrab? Cov nruab nrab kev tshawb xav ntawm molecular evolution tuav tias feem ntau evolutionary hloov nyob rau hauv molecular theem, thiab feem ntau ntawm cov variation nyob rau hauv thiab nruab nrab ntawm hom, yog vim randomgenetic drift ntawm mutant alleles uas yog. selectivelyneutral.
Tom qab ntawd, lo lus nug yog, qhov piv txwv ntawm kev hloov pauv nruab nrab yog dab tsi?
Cov no kev hloov pauv hu ua neutralmutations . Piv txwv suav nrog cov ntsiab lus uas ntsiag to kev hloov pauv . Lawv yog nruab nrab vim lawv tsis hloov cov amino acids hauv cov proteins lawv encode. Cells muaj ntau yam kho mechanisms kho kev hloov pauv hauv DNA.
Neutral alleles yog dab tsi?
nruab nrab allele . ib daim ntawv ntawm cov noob uas thaum muaj nyob rau hauv ib tug kab mob nyob rau hauv tsis muaj txoj kev hloov lub FITNESS ntawm tus neeg ntawd kom ciaj sia thiab yug me nyuam.
Pom zoo:
Dab tsi yog qhov tseem ceeb ntawm kev hloov pauv nruab nrab?
Kev hloov pauv nruab nrab yog kev hloov pauv hauv DNA ib ntus uas tsis muaj txiaj ntsig lossis cuam tshuam rau lub peev xwm ntawm lub cev kom muaj sia nyob thiab yug me nyuam. Kev hloov pauv nruab nrab kuj yog lub hauv paus rau kev siv cov moos molecular los txheeb xyuas cov xwm txheej hloov pauv xws li speciation thiab hloov pauv lossis hloov pauv hluav taws xob
Dab tsi yog qhov kev hloov pauv hloov pauv?
Kev hloov pauv, hauv molecular biology, yog hais txog kev hloov pauv hauv deoxyribonucleic acid (DNA), qhov twg ib qho (ob lub nplhaib) purine hloov pauv rau (ib lub nplhaib) pyrimidine, los yog vice versa
Dab tsi yog qhov txawv ntawm ib puag ncig kev hloov pauv thiab kev hloov pauv qub txeeg qub teg?
Qhov sib txawv ntawm cov yam ntxwv ntawm cov tib neeg ntawm tib hom yog hu ua variation. Qhov no yog inherited variation. Qee qhov kev hloov pauv yog qhov tshwm sim ntawm qhov sib txawv ntawm ib puag ncig, lossis ib tus neeg ua dab tsi. Qhov no yog hu ua environmental variation
Qhov nruab nrab nruab nrab ntawm lub ntiaj teb yog dab tsi?
Lub teb chaws qhov ntsuas kub yog 2.91 ° C (5.24 ° F) saum toj no 1961-1990 qhov nruab nrab, tawg cov ntaub ntawv yav dhau los tau teev tseg hauv 2013 los ntawm 0.99 ° C (1.78 ° F)
Peb qhov laj thawj tseem ceeb ntawm kev hloov pauv hloov pauv yog dab tsi?
Allele frequencies nyob rau hauv ib tug pej xeem yuav hloov vim plaub lub hauv paus zog ntawm evolution: Natural Selection, Genetic Drift, Mutations thiab Gene Flow. Kev hloov pauv yog qhov kawg ntawm cov alleles tshiab hauv cov noob caj noob ces. Ob ntawm cov txheej txheem tseem ceeb tshaj plaws ntawm kev hloov pauv hloov pauv yog: Natural Selection thiab Genetic Drift