Video: Polyploid cog yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Polyploidy yog lub xeev ntawm ib lub cell los yog kab mob uas muaj ntau tshaj ob khub (homologous) pawg chromosomes. Txawm li cas los xij, qee yam kab mob polyploid , thiab polyploidy tshwj xeeb tshaj yog nyob rau hauv nroj tsuag . Ntxiv rau, polyploidy tshwm sim hauv qee cov ntaub so ntswg ntawm cov tsiaj uas tsis yog diploid, xws li tib neeg cov leeg nqaij.
Hauv qhov no, cov nroj tsuag polyploid tsim li cas?
Thaum ib tug tshiab-arisen tetraploid (4n) cog sim yug nrog nws cov poj koob yawm txwv hom (ib tug backcross), triploid offspring yog tsim . Cov no tsis muaj menyuam vim lawv ua tsis tau daim ntawv gametes nrog sib npaug assortment ntawm chromosomes. Fusion ntawm cov gametes no ua rau muaj zog, tag nrho-fertile, polyploid nroj tsuag nrog 36 chromosomes.
Tsis tas li ntawd, polyploid nroj tsuag quizlet yog dab tsi? Polyploid ntau yam ntawm nroj tsuag uas muaj tus lej tsis sib npaug ntawm cov chromosome feem ntau yog dab tsi? Cov no yog tsim los ntawm crosses ntawm diploid nroj tsuag thiab tetraploid nroj tsuag . Cov no yog ze li ntawm tsis muaj noob thiab cov noob me me uas tsim tau me dua li feem ntau.
Ib yam li ntawd, yog vim li cas polyploidy muaj nyob rau hauv cov nroj tsuag?
Polyploidy muaj nyob rau hauv cov nroj tsuag tshaj li nyob rau hauv cov tsiaj vim hais tias nyob rau hauv cov tsiaj kev sib deev kev txiav txim mechanism muaj cov naj npawb thiab hom chromosomes kev sib deev. Nroj tsuag Ntawm qhov tod tes, tsis muaj kev txiav txim siab txog poj niam txiv neej (raws li tus naj npawb lossis hom chromosomes) thiab feem ntau ntawm lawv tuaj yeem tsim tawm vegetatively.
Polyploidy yug me nyuam yog dab tsi?
Polyploidy hais txog thaum lub cev muaj ntau tshaj ob pawg ntawm chromosomes. Siv cov yam ntxwv ntawm polyploidy muab cov cog qoob loo ntau txoj hauv kev los tsim cov nroj tsuag tshiab thiab txhim kho cov qoob loo uas twb muaj lawm.
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