Puas yog amphibian qe Isolecithal?
Puas yog amphibian qe Isolecithal?

Video: Puas yog amphibian qe Isolecithal?

Video: Puas yog amphibian qe Isolecithal?
Video: Xov xwm ntxawg muas, puas yog maiv kwm raug dab thiaj tuag.11/11/2022 - YouTube 2024, Lub peb hlis ntuj
Anonim

Yog, lub qe ntawm ib amphibian yog cais raws li isolecithal kev . Ua li no, amphibian qe zoo li ntses qe nrog ib tug me me, centrally tso yolk

Ntawm no, hom qe dab tsi yog amphibian muaj?

Cov noog, cov tsiaj reptiles, thiab tsiaj txhu muaj amniotic qe . Vim amphibian qe tsis txhob muaj ib amnion, qe yuav qhuav yog tias lawv tau muab tso rau hauv av, yog li ntawd amphibians lay lawv qe hauv dej. Cov larvae ntawm feem ntau amphibians muaj gills thiab zoo li ntses thaum lawv yug los.

Ib sab saum toj no, tib neeg qe Isolecithal? Nws tseem hu ua Polylecithal qe . Isolecithal los yog Homolecithal Qe : Hauv isolecithal qe , qhov me me ntawm cov qe tam sim no yog sib npaug thoob plaws hauv ooplasm (xws li echinoderms, Amphioxus, tsiaj txhu). Tus mob no feem ntau pom nyob rau hauv qe nrog me ntsis ntawm yolk.

Tsis tas li ntawd, Isolecithal qe yog dab tsi?

Isolecithal qe hais txog kev faib tawm ntawm yolk nyob rau hauv cytoplasm. Nws tshwm sim nyob rau hauv cov kab mob uas muaj me ntsis yolk, zoo li cov tsiaj.

Kev faib tawm ntawm qe yog dab tsi?

Vertebrate qe tuaj yeem yog cais los ntawm tus txheeb ze ntawm yolk. Yooj yim qe nrog me yolk yog hu ua microlecithal, nruab nrab-qhov loj me qe nrog qee cov yolk hu ua mesolecithal, thiab loj qe nrog ib tug loj concentrated yolk yog hu ua macrolecithal.

Pom zoo: