Obligate apomixis yog dab tsi?
Obligate apomixis yog dab tsi?

Video: Obligate apomixis yog dab tsi?

Video: Obligate apomixis yog dab tsi?
Video: Reproduction in Organisms: Introduction 1.2 2024, Kaum ib hlis
Anonim

Facultative apomixis txhais tau tias apomixis tsis tas li tshwm sim, piv txwv li kev sib deev kev sib deev kuj tuaj yeem tshwm sim. Nws zoo nkaus li tias tag nrho apomixis nyob rau hauv cov nroj tsuag yog facultative; nyob rau hauv lwm yam lus, hais tias " obligate apomixis " yog ib qho khoom pov thawj ntawm kev soj ntsuam tsis txaus (tsis muaj kev sib deev tsis sib xws).

Tom qab ntawd, Apomixis yog dab tsi thiab nws hom?

Peb hom ntawm apomixis feem ntau lees paub - diplospory, apospory thiab adventitious embryony. Cov no apomictic Cov txheej txheem tau piav qhia piv rau cov txheej txheem kev sib deev hauv kev tsim ntawm ib qho Polygonum- hom embryo hnab.

Kuj Paub, Apomixis yog dab tsi thiab nws qhov tseem ceeb yog dab tsi? Apomixis yog cov txheej txheem ntawm cov noob qoob loo tsis cuam tshuam nrog cov txheej txheem ntawm meiosis thiab syngamy. Nws plays ib tseem ceeb Lub luag haujlwm hauv kev tsim cov noob hybrid. Txoj kev tsim cov noob hybrid los ntawm kev cog qoob loo yog kim heev rau cov neeg ua liaj ua teb. Apomixis tiv thaiv kev poob ntawm cov cim tshwj xeeb hauv hybrid.

Yog li ntawd, dab tsi yog apomixis hauv cov nroj tsuag?

Abstract. Apomixis (asexual noob tsim) yog qhov tshwm sim ntawm a cog tau txais lub peev xwm los hla qhov tseem ceeb tshaj plaws ntawm kev sib deev kev sib deev: meiosis thiab fertilization. Yog tsis xav tau txiv neej fertilization, lub resulting noob germinates a cog uas txhim kho raws li niam txiv clone.

Dab tsi ua rau Apomixis?

Physiological yam thiab cov tshuaj hormones tau xav tias ncaj qha ua rau ntawm apomixis . Piv txwv li, ib txoj kev xav tau npaj cov tshuaj hormones tsim thaum cov nroj tsuag raug mob induced apomixis . Stebbins (1941) txiav txim siab tawm polyploidy raws li ib tug ua rau ntawm apomixis vim hais tias kev sib deev polyploids ntau dua cov apomicts.

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