Ua ntej, txhua tus chromosome ua ib daim qauv ntawm nws tus kheej, khaws nws txuas ntawm ib qho. Lawv condense, tsim ib tug X-puab. Tam sim no cov neeg koom tes chromosome tau ua ke thiab ob, los yog plaub, yuav puag. … Qhov kawg tshwm sim yog phev los yog lub qe qe nrog 23 chromosomes, ib nrab tus lej.
Dab tsi yog qhov teeb meem kawg uas cov phev ntsib ua ntej nws nkag mus thiab fertilize lub qe?
Yuav ua li cas lub qe thawb nrog rau hauv txoj hlab pas? mus fertilize lub qe, phev ntsib obstacles, dab tsi yog qhov kawg lawv ntsib ua ntej lawv nkag mus rau lub qe? noob qhib thiab tawm los ua cov protein. Collagen yog cov protein uas ua rau cov leeg thiab cov pob txha, keratin ua plaub hau.
Cov qauv siv dab tsi los sau cov ntshav thiab cov khoom noj los ntawm cov niam cov ntshav thiab dhau mus rau txoj hlab ntaws?
Cov placenta tso cai rau cov khoom noj thiab cov khoom pov tseg sib pauv ntawm leej niam thiab tus menyuam hauv plab. Tus me nyuam hauv plab txuas nrog lub plab los ntawm txoj hlab ntaws.
Lub blastocyst tawg tawm ntawm Zona li cas?
Zona pellucida yog khaws cia tom qab fertilization thiab nyob ib puag ncig tus neeg tsim embryo rau ob peb hnub. … Kev tawg ntawm zona pellucida tshwm sim nyob rau hauv kev cuam tshuam ntawm ob lub zog: kev siv tshuab siab ntawm cov blastocyst loj hlob ntawm thaj chaw thiab tshuaj lom neeg tawg ntawm cov khoom siv hauv cheeb tsam nrogsecreted lytic enzymes.
DNA zoo heev ua dab tsi?
DNA tau ua yeeb yam rau ntau tshaj plaub txhiab xyoo rau ib qho laj thawj tseem ceeb: nws yog qhov zoo heev zoo ntawm kev luam nws tus kheej. Cov ntawv luam tuaj yeem dhau mus rau tiam tshiab ntawm ob peb txoj hauv kev. Yog tias koj yog kab mob, tej zaum koj yuav tau mus rau hauv cloning-ua cov qauv ntawm koj tus kheej.
