2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Kev Hloov Ntawm Ib Tiam: Nroj tsuag muaj lub neej voj voog uas hloov pauv ntawm cov kab mob ntau lub cev haploid thiab cov kab mob multicellular diploid. Hauv qee cov nroj tsuag, xws li ferns, ob qho tib si haploid thiab diploid cog theem yog dawb-nyob.
Dab tsi yog ob qhov tseem ceeb ntawm kev hloov caj ces los ntawm meiosis?
Kev hla dhau thiab kev ywj pheej Assortment yog ob qhov chaw loj ntawm kev hloov pauv uas tshwm sim los ntawm cov txheej txheem ntawm meiosis.
Peb hom kev ua neej yog dab tsi?
Hais txog nws qhov ploidy, muaj peb hom voj voog; haplontic life cycle, diplontic life cycle, diplobiontic life cycle. Peb hom kev voj voog no muaj kev hloov pauv haploid thiab diploid theem (n thiab 2n).
Qhov twg hauv qab no yog piv txwv ntawm lub voj voog ntawm lub neej diploid?
Piv txwv ntawm lub voj voog lub neej diploid-dominant: tib neeg lub neej voj voog. Nyob rau hauv ib tug neeg laus (2n), qe yog tsim los ntawm meiosis nyob rau hauv lub zes qe menyuam ntawm ib tug poj niam, los yog phev yog tsim los ntawm meiosis nyob rau hauv lub testis ntawm ib tug txiv neej. Cov qe thiab cov phev yog 1n, thiab lawv muab tso rau hauv fertilization tsim ib zygote (2n).
Dab tsi yog peb pawg tseem ceeb ntawm kev ua neej nyob hauv ntau lub cev?
Muaj peb yam tseem ceeb ntawm lub neej voj voog nyob rau hauv ntau cov kab mob: diploid-dominant, nyob rau hauv uas multicellular diploid theem yog qhov pom tseeb tshaj plaws lub neej theem(thiab tsis muaj multicellular haploid theem), xws li cov tsiaj feem ntau suav nrog tib neeg; haploid-dominant, nyob rau hauv uas multicellular haploid theem yog …
Pom zoo:
Dab tsi yog qhov hloov pauv thiab hloov pauv hloov pauv?
Point mutations hloov ib leeg nucleotide. Frameshift kev hloov pauv yog ntxiv lossis tshem tawm ntawm nucleotides uas ua rau muaj kev hloov pauv hauv kev nyeem ntawv. frameshift thiab point mutation yog dab tsi? Ib qho kev hloov pauv cuam tshuam rau ib khub hauv paus.
Qhov kev hloov pauv no puas yuav ua rau muaj kev hloov pauv hloov pauv?
Yog li, yog tias muaj kev hloov pauv, piv txwv li, kev ntxig lossis tshem tawm ntawm nucleotide, tshwm sim, qhov no tuaj yeem ua rau kev hloov pauv ntawm kev nyeem ntawv. Nws hloov tag nrho cov amino acid ib ntus. Cov kev hloov pauv no yog hu ua frameshift mutation (tseem hu ua kev nyeem ntawv hloov pauv, nyeem ntawv hloov pauv, lossis framing yuam kev).
Qhov twg yog qhov kev hloov pauv hloov pauv hloov pauv?
Semiconservative replication piav qhia txog cov txheej txheem ntawm DNA replication nyob rau hauv tag nrho cov paub hlwb. DNA replication tshwm sim ntawm ntau lub hauv paus pib ntawm kev rov ua dua raws DNA qauv strand. Raws li DNA ob chav helix yog unwound by helicase, replication tshwm sim nyias ntawm txhua tus qauv strand nyob rau hauv antiparallel cov lus qhia.
Qhov kev hloov pauv twg yog xav tias yuav cuam tshuam los ntawm kev hloov pauv hloov pauv?
Dependent Variable Qhov sib txawv uas nyob ntawm lwm yam uas ntsuas. Cov kev hloov pauv no yuav tsum tau hloov pauv raws li qhov kev sim ua haujlwm ntawm tus kheej hloov pauv lossis hloov pauv. Nws yog cov nyhuv presumed. Qhov kev tshawb fawb hloov pauv twg yog qhov tshwm sim?
Los ntawm kev hloov pauv hloov pauv hloov pauv?
Kev hloov pauv hloov pauv hloov pauv (TMA) yog qhov isothermal (tsis hloov pauv nucleic acid kub), ib leeg-tube nucleic acid amplification system siv ob lub enzymes, RNA polymerase thiab thim rov qab kev sau ntawv. … Cov txheej txheem no tuaj yeem siv los tsom rau RNA thiab DNA.
