2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Thaum lawv yug los, cov menyuam ntxaib zoo tib yam sib koom tib DNA, uas piav qhia vim li cas lawv feem ntau zoo nkaus li zoo ib yam. … Cov kwv tij ntxaib tsis sib koom tib yam DNA. Qhov tseeb, lawv sib koom tsuas yog ib nrab ntawm tib cov noob. Qhov no yog vim li cas cov kwv tij ntxaib feem ntau tsis zoo ib yam li cov kwv tij thiab cov muam.
Yuav ua li cas cov menyuam ntxaib tsis zoo ib yam?
Vim qhov tshwm sim ntawm ib puag ncig, cov tshuaj hu ua "epigenetic cov cim" txuas rau chromosomes thiab tuaj yeem tig cov noob tshwj xeeb rau lossis tawm. Yog li cov menyuam ntxaib zoo ib yam nrog DNA zoo ib yam tuaj yeem muaj cov noob sib txawv, ua rau lawv saib thiab ua txawv, thiab txawm tsim cov kab mob sib txawv xws li mob qog noj ntshav.
ntxaib uas tsis zoo li cas?
Cov menyuam ntxaib uas tsis zoo ib yam tseem hu ua tus menyuam ntxaib lossis cov menyuam ntxaib dizygotic (los ntawm ob lub zygotes, qhov peb hu ua qhov ntxov tshaj plaws embryo thaum lub qe thiab phev fuse).
Niam ntxaib 100% zoo ib yam?
Nws muaj tseeb zoo tib yam ntxaib sib koom lawv DNA code rau ib leeg. Qhov no yog vim cov menyuam ntxaib zoo tib yam tau tsim los ntawm tib cov phev thiab qe los ntawm lawv txiv thiab niam. (Qhov sib txawv, cov menyuam ntxaib yog tsim los ntawm ob lub phev sib txawv thiab ob lub qe sib txawv.)
Vim li cas tus ntxaib zoo ib yam zoo ib yam?
Vim cov menyuam ntxaib zoo ib yam los ntawm ib qho zygote uas sib cais ua ob, lawv muaj tib cov noob zoo tib yam- raws nraim tib daim ntawv qhia. Lawv yuavob leeg muaj ib lub qhov muag thiab plaub hau xim tib yam, thiab yuav zoo tib yam.
Pom zoo:
Puas yog ob tug menyuam ntxaib ntawm tus muam tus muam?
Mary-Kate Olsen yog tus tsim qauv Asmeskas zam, yav dhau los ua yeeb yam thiab tsim tawm. Nws pib nws txoj hauj lwm ua yeeb yam cuaj hlis tom qab nws yug los, sib koom lub luag haujlwm ntawm Michelle Tanner nrog nws tus muam ntxaib Ashley Olsen hauv TV sitcom Full House.
Cov menyuam ntxaib monozygotic puas muaj dna tib yam?
Nws muaj tseeb zoo tib yam ntxaib sib koom lawv DNA code rau ib leeg. Qhov no yog vim cov menyuam ntxaib zoo tib yam tau tsim los ntawm tib cov phev thiab qe los ntawm lawv txiv thiab niam. (Qhov sib txawv, cov menyuam ntxaib yog tsim los ntawm ob lub phev sib txawv thiab ob lub qe sib txawv.
Puas yog lub tsev menyuam thiab lub tsev menyuam zoo ib yam?
Lub hollow, pear-puab lub cev hauv tus poj niam lub plab mog. Lub tsev menyuam yog qhov chaw uas tus menyuam hauv plab (tus menyuam hauv plab) loj hlob thiab loj hlob. Kuj hu ua uterus. qhov sib txawv ntawm lub tsev menyuam thiab lub tsev menyuam yog dab tsi?
Tus menyuam ntxaib puas tuaj yeem yug lub hlis ua ntej lwm tus?
Feem ntau, ntxaib yug hauv feeb ntawm ib leeg. Tab sis yog tias txhua yam ua tau zoo, ob tug me nyuam muaj txuj ci tseem ceeb hauv Washington State yuav ua kev zoo siab rau lawv lub hnub yug nyob rau plaub lub hlis sib nrug. Zaj dab neeg txawv txawv tau pib thaum lub hli tas los, thaum cov tub hluas niam, Holli Gorveatt, mus ua haujlwm poob siab ntawm 23 lub lis piam.
Puas yog cov menyuam ntxaib zoo ib yam monozygotic lossis kiv taub hau?
Twins account rau ntau dua 90 feem pua ntawm ntau qhov kev yug. Muaj ob hom menyuam ntxaib – zoo tib yam (monozygotic) thiab fraternal (dizygotic). Txhawm rau tsim cov menyuam ntxaib zoo ib yam, ib lub qe fertilized (ovum) sib cais thiab tsim ob tus menyuam mos uas muaj cov ntaub ntawv caj ces tib yam.
