Qhov sib txawv tseem ceeb ntawm cov menyuam ntxaib monozygotic thiab dizygotic ntxaib yog tias cov menyuam ntxaib monozygotic zoo ib yam txij li lawv tsim los ntawm ib lub zygote thaum cov menyuam ntxaib dizygotic tsis zoo ib yam txij li lawv tsim los ntawm ob lub zygotes cais.
Ntxaib yog ob tug xeeb ntxwv uas tsim los ntawm tib lub cev xeeb tub. Yog li ntawd, lawv tuaj yeem yog monozygotic (zoo tib yam) lossis dizygotic (fraternal). Cov tsev neeg uas muaj keeb kwm ntawm kwv tij ntxaib ntxaib muaj peev xwm tsim tau cov menyuam ntxaib ntau dua li cov tsev neeg uas tsis muaj menyuam ntxaib. Nws yog vim hais tias cov kwv tij ntxaib yog cov xeeb ntxwv thaum cov menyuam ntxaib zoo tib yam tsis yog. Cov kwv tij ntxaib tau tshwm sim los ntawm cov noob nyob hauv X chromosome. Yog li ntawd, yog hais tias ib tug txiv neej muaj cov kwv tij ntxaib nyob rau hauv nws tsev neeg, nws muaj peev xwm kis tus ntxaib noob rau nws tus ntxhais.
Muaj tsib qhov kev hloov pauv hauv kev sib tw. Ntawm lawv, peb variations yog dizygotic (fraternal); txiv neej-poj niam ntxaib (hom feem ntau), poj niam-poj niam dizygotic ntxaib, thiab txiv neej-txiv neej dizygotic ntxaib. Lwm ob qhov kev hloov pauv yog cov menyuam ntxaib monozygotic; txiv neej-txiv neej monozygotic ntxaib thiab poj niam-poj niam monozygotic ntxaib. Ntxiv mus, txiv neej-poj niam cov menyuam ntxaib monozygotic tuaj yeem ua tau tab sis sib piv tsawg heev. Yog li ntawd, qhov kev tuag ntawm lub tsev menyuam yog siab dua rau cov menyuam ntxaib, thiab cov txiv neej muaj feem cuam tshuam rau kev tuag ntau dua li poj niam.
Leej twg yog Monozygotic ntxaib?
Monozygotic ntxaib yog "zoo tib yam" menyuam ntxaib. Cov menyuam ntxaib zoo ib yam tshwm sim thaum ib tus zygote faib ua ob lub embryos cais. Yog li ntawd, lo lus ua monozygotic. Nyob rau hauv tej yam ntuj tso monozygotic twinning, tus ntxaib yog tsim thaum lub blastocyst tsoos phua lub progenitor hlwb mus rau hauv ib nrab, thiab cov genetic khoom faib mus rau hauv ob lub opposite sab ntawm lub embryo. Thaum kawg, ob lub fetuses sib cais. Kev faib cov zygote rau hauv ob lub embryos yog ib qho kev tshwm sim tshwm sim los yog random. Yog li no, cov menyuam ntxaib monozygotic tsis yog los ntawm noob neej. Monozygotic ntxaib kuj tuaj yeem tsim tau los ntawm kev sib cais ntawm embryo.
Daim duab 01: Kev Txhim Kho ntawm Twins
Yuav luag txhua tus menyuam ntxaib monozygotic yog cov caj ces zoo ib yam, thiab ib txwm lawv yog poj niam txiv neej tib yam tshwj tsis yog muaj kev hloov pauv thaum lub sijhawm kev loj hlob. Txawm li cas los xij, lawv tsis muaj cov ntiv tes tib yam. Muaj qee zaus, cov menyuam ntxaib monozygotic tuaj yeem nthuav tawm txawv phenotype.
Cov menyuam ntxaib sib koom yog cov menyuam ntxaib monozygotic uas lawv lub cev tau koom ua ke thaum cev xeeb tub uas ib leeg zygote ntawm cov menyuam ntxaib monozygotic tsis sib cais, thiab zygote pib sib cais tom qab hnub 12 tom qab fertilization.
Leej twg yog Dizygotic Twins?
Dizygotic lossis fraternal ntxaib yog "tsis zoo ib yam" cov menyuam ntxaib lossis cov menyuam ntxaib sib txawv. Ob lub qe yog nws tus kheej fertilized los ntawm ob lub phev sib txawv, thiab cov qe fertilized yog cog nyob rau hauv lub tsev me nyuam phab ntsa tib lub sij hawm thiab ua ob zygotes. Li no, lub sij hawm yuav dizygotic, thiab qhov tshwm sim yog kwv tij ntxaib.
Daim duab 02: Dizygotic Twins
Zoo li lwm cov kwv tij, cov menyuam ntxaib dizygotic kuj muaj qhov tsawg kawg nkaus uas muaj tib chromosome. Tej zaum lawv yuav muaj qhov zoo sib xws lossis tej zaum txawv ntawm ib leeg; kuj, tej zaum lawv yuav yog poj niam txiv neej los sis txawv poj niam txiv neej. Qhov tseem ceeb, lawv muaj hnub nyoog tib yam. Cov menyuam ntxaib Dizygotic muaj ntau dua rau cov niam laus, thiab siab dua 35 xyoo txij li tus menyuam ntxaib ob zaug nrog hnub nyoog.
Dab tsi yog qhov zoo sib xws ntawm Monozygotic thiab Dizygotic Twins?
- Monozygotic thiab dizygotic yog ob hom twining.
- Ob leeg tsim cov tib neeg tshwj xeeb.
- Tsis tas li, txhua tus muaj tus ntiv tes sib txawv.
Qhov txawv ntawm Monozygotic thiab Dizygotic Twins yog dab tsi?
Monozygotic thiab dizygotic ntxaib yog ob hom menyuam ntxaib. Raws li cov npe qhia, cov menyuam ntxaib monozygotic tsim los ntawm ib lub zygote thaum cov menyuam ntxaib dizygotic tsim los ntawm ob lub zygotes cais. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm monozygotic thiab dizygotic ntxaib. Monozygotic ntxaib tshwm sim vim kev sib cais ntawm zygote rau hauv ob halves random. Ntawm qhov tod tes, cov menyuam ntxaib dizygotic tshwm sim vim muaj ob lub qe los ntawm ob lub phev cais. Li no, qhov no yog qhov sib txawv tseem ceeb ntawm cov menyuam ntxaib monozygotic thiab dizygotic.
Ntxiv mus, cov menyuam ntxaib monozygotic zoo ib yam thaum cov menyuam ntxaib dizygotic tsis zoo ib yam. Tsis tas li ntawd, cov menyuam ntxaib monozygotic tsis yog keeb kwm thaum cov menyuam ntxaib dizygotic yog keeb kwm. Yog li, nws kuj yog qhov sib txawv ntawm cov menyuam ntxaib monozygotic thiab dizygotic.
Cov duab hauv qab no muab cov lus piav qhia ntxiv txog qhov sib txawv ntawm cov menyuam ntxaib monozygotic thiab dizygotic.
Summary – Monozygotic vs Dizygotic Twins
Ntxaib tuaj yeem yog monozygotic lossis kiv taub hau. Monozygotic ntxaib yog tib yam, thiab lawv tsim los ntawm ib tug zygote. Ntawm qhov tod tes, cov menyuam ntxaib dizygotic tsis zoo ib yam, thiab lawv tsim los ntawm ob lub zygotes. Tsis tas li ntawd, cov menyuam ntxaib monozygotic pib random. Yog li ntawd, lawv tsis yog noob neej. Ntawm qhov tod tes, cov menyuam ntxaib dizygotic tshwm sim vim yog fertilization ntawm ob lub qe los ntawm ob cov phev, thiab nws yog keeb kwm thiab. Tsis tas li ntawd, cov menyuam ntxaib monozygotic sib koom ib qho placenta thaum cov menyuam ntxaib dizygotic muaj ob lub placentae. Qhov no yog cov ntsiab lus ntawm qhov sib txawv ntawm cov menyuam ntxaib monozygotic thiab dizygotic.
