Video: Vim li cas gametes tsuas muaj ib qho allele?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Yog peb gametes muaj ntau dua ib alle rau txhua tus noob , ces lub resulting zygote los ntawm fertilization ntawm ob gametes yuav muaj ntau tshaj 2 alleles rau txhua tus noob thiab yuav muaj ntau tshaj ob homologous khub ntawm chromosomes. Hauv tib neeg, qee zaum, thaum meiosis, a gamete muaj ntau dua ib luam ntawm ib tug chromosome.
Yog li ntawd, puas yog gamete tsuas muaj ib qho allele?
Tej zaum yuav muaj ntau yam ua tau alleles rau tej noob , tab sis ib tug diploid cell los yog tsiaj muaj nkaus xwb ob alleles ntawm txhua tus noob los yog ob daim ntawv luam ntawm ib allele ; ib haploid gamete muaj ib luam ntawm txhua tus noob , yog li tsuas yog ib qho allele.
Tsis tas li ntawd, vim li cas thiaj yuav tsum muaj gamete nqa ib qho allele sawv cev los ntawm tsab ntawv los ntawm txhua tus noob? RULE OF SEGREGATION (Kev sib cais) Thaum twg gametes raug tsim, cov alleles ntawm noob cais thiab mus rau hauv cov hlwb sib txawv; nyob rau hauv lwm yam lus, ib tsab ntawv yog ntim rau hauv ib sex cell thiab lwm yam tsab ntawv yog ntim rau hauv lwm qhov. Thov nco ntsoov tias txhua kev sib deev cell muaj 50% ntawm qhov qub noob.
Tib neeg kuj nug, vim li cas gametes tsuas muaj ib nrab ntawm cov alleles ntawm cov kab mob?
Thaum lub cell sib cais, txhua tus ntxhais tshiab cell muaj nkaus xwb ob versions. Cov ntxhais cell ua gametes , thiab lawv txhua tus muaj xwb ib version ntawm txhua tus allele . Cov hlwb no haploid, vim lawv muaj ib nrab ib txwm tus lej ntawm chromosomes.
Dab tsi ua rau gametes txawv?
Genetic variation yog nce los ntawm meiosis Thaum lub sij hawm fertilization, 1 gamete los ntawm txhua tus niam txiv ua ke los ua ib lub zygote. Vim hais tias ntawm recombination thiab ywj siab assortment nyob rau hauv meiosis, txhua gamete muaj a txawv set ntawm DNA. Qhov no tsim ib tshwj xeeb kev sib xyaw ntawm cov noob hauv qhov tshwm sim zygote.
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