Video: Moss gametes tsim cov lus teb li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Gametes tsim nyob rau hauv multicellular haploid gametophyte (los ntawm Greek phyton, "cog"). Fertilization muab nce mus rau ib tug multicellular diploid sporophyte, uas tsim tawm haploid spores ntawm meiosis. Mitotic faib nyob rau hauv gametophyte yuav tsum tau tsim tawm tus gametes.
Nyob rau hauv txoj kev no, moss gametes ua li cas hlwb?
Mauxes yog seedless, uas tsis yog-vascular spores-cov kabmob cov nroj tsuag uas belongs rau division bryophytes. Cov spores faib los ntawm mitosis thiab tsim mus rau hauv cov nroj tsuag haploid lossis gametophyte. Lawv tsim tawm haploid gametes los ntawm mitosis. Cov no gametes fuse los ua ib tug diploid zygote uas loj hlob mus rau hauv ib tug diploid sporophyte.
Kuj Paub, cov phev ntawm moss thauj mus rau Archegonia li cas? Hauv ntau mosses cov nplooj nyob ib ncig ntawm tus txiv neej qia taub hau uas nyob ib puag ncig lub antheridia tsim ib 'txheej khob'. Cov phev yog tso rau hauv cov dej nag los yog cov condensation uas sib sau hauv lub khob thiab tom qab ntawd txau tawm thaum cov nag los tawm tsam cov dej. Nyob rau hauv no txoj kev phev yog nqa mus rau archegonia nyob ze cov nroj tsuag.
Kuj tseem paub yog, gametes tsim tawm li cas?
Gametes yog tsim los ntawm meiosis (txo faib), nyob rau hauv uas ib tug kab mob cell undergoes ob fissions, ua rau lub ntau lawm ntawm plaub gametes . Thaum fertilization, txiv neej thiab poj niam gametes fuse, tsim tawm diploid (piv txwv li, muaj cov chromosomes ua ke) zygote.
Puas muaj nyob hauv ferns thiab moss gametophyte thiab tsim cov phev ua luam dej?
Lawv flagellated phev xav tau ib tug nyias zaj duab xis ntawm dej ua luam dej nruab nrab ntawm lub antheridium thiab archegonium. Thiab thaum tus me nyuam sporophyte loj hlob los ntawm gametophyte , nws raug desiccation (kom qhuav). Qhov yooj yim lub tswv yim ntawm ib tug dawb- ua luam dej phev thiab tsis yog- kev xav qe is shared by nroj tsuag , tsiaj, thiab algae.
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