Lub hom phiaj ntawm alternation ntawm tiam nyob rau hauv cov nroj tsuag yog dab tsi?

Video: Lub hom phiaj ntawm alternation ntawm tiam nyob rau hauv cov nroj tsuag yog dab tsi?

2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36

Cov kev hloov ntawm tiam neeg tso cai rau ob qho tib si dynamic thiab volatile txoj cai ntawm kev sib deev kev sib deev thiab kev ruaj khov thiab zoo ib yam ntawm asexual reproduction. Thaum cov sporophyte tsim spores, cov hlwb raug meiosis, uas tso cai rau gametophyte. tiam kom recombine cov noob caj noob ces tam sim no.

Tom qab ntawd, lub hom phiaj ntawm kev hloov ntawm ntau tiam neeg yog dab tsi?

Lub sij hawm kev hloov ntawm tiam neeg yog siv los piav txog cov txheej txheem hauv lub neej voj voog ntawm qee cov eukaryotes. Nws piav txog ib kev hloov nyob rau hauv cov ntaub ntawv uas tshwm sim nyob rau hauv cov nroj tsuag thiab ib co protists. Ib daim ntawv yog diploid, nrog 2n chromosomes: lub sporophyte. Lwm daim ntawv yog haploid nrog tsuas yog ib pawg ntawm chromosomes: gametophyte.

yog vim li cas cov nroj tsuag lub neej voj voog yog piav raws li ib tug alternation ntawm tiam? Alternation ntawm tiam piav ib tsob nroj lub neej voj voog raws li nws alternates ntawm ib theem kev sib deev, los yog tiam thiab theem asexual. Kev sib deev tiam hauv nroj tsuag tsim gametes, los yog kev sib deev hlwb thiab hu ua gametophyte tiam . Lub asexual theem tsim spores thiab hu ua sporophyte tiam.

Yog li ntawd, dab tsi yog alternation ntawm tiam nyob rau hauv cov nroj tsuag?

Alternation ntawm tiam (tseem hu ua metagenesis) yog hom lub neej voj voog uas tshwm sim hauv cov nroj tsuag thiab algae hauv Archaeplastida thiab Heterokontophyta uas muaj qhov sib txawv ntawm kev sib deev haploid thiab diploid asexual theem. Cov spores haploid germinate thiab loj hlob mus rau hauv haploid gametophyte.

Lub hom phiaj ntawm Sporophyte hauv cov nroj tsuag yog dab tsi?

A sporophyte yog ib tug multicellular diploid tiam pom nyob rau hauv nroj tsuag thiab algae uas undergo alternation ntawm tiam. Nws tsim cov spores haploid uas tsim los ua gametophyte. Lub gametophyte ces ua gametes uas fuse thiab loj hlob mus rau hauv ib sporophyte . Hauv ntau nroj tsuag , cov sporophyte tiam yog tiam tseem ceeb.

Pom zoo:

Dab tsi yog qhov txawv ntawm daim ntawv qhia lub hom phiaj thiab daim ntawv qhia lub hom phiaj tshwj xeeb?

Qhov tseem ceeb hauv daim ntawv qhia dav dav yog nyob ntawm qhov chaw. Phab ntsa daim duab qhia chaw, feem ntau daim ntawv qhia pom nyob rau hauv atlases, thiab txoj kev maps yog tag nrho cov nyob rau hauv qeb no. Thematic maps, tseem hu ua daim ntawv qhia tshwj xeeb, qhia txog thaj chaw faib khoom ntawm ib lub ntsiab lus lossis qhov tshwm sim

Dab tsi yog qhov txawv ntawm P tiam f1 tiam thiab f2 tiam?

P txhais tau hais tias niam txiv tiam thiab lawv tsuas yog cov nroj tsuag ntshiab xwb, F1 txhais tau tias thawj tiam thiab lawv yog tag nrho cov hybrids uas qhia qhov tseem ceeb, thiab F2 txhais tau tias tiam thib ob, uas yog cov xeeb ntxwv ntawm P. Yog hais tias ib tug neeg muaj ib tug tseem ceeb allele, nws yuav. ua yeeb yam