Ib tug me nyuam yug los ntawm ib tug ntsib: uas ntawm ib tug oocyte ntawm leej niam thiab ib tug phev ntawm leej txiv sab. Txhua tus coj lawv cov khoom siv caj ces:

• 22 chromosomes + ib X chromosome rau oocyte
• 22 chromosomes + X lossis Y chromosome rau cov phev

Fertilization muab yug rau lub qe hu ua zygote, thawj lub xov tooj ntawm leej niam thiab leej txiv chromosomes koom ua ke. Lub genome yog tiav: 44 chromosomes thiab 1 khub ntawm kev sib deev chromosomes. Los ntawm lub rooj sib tham ntawm lub qe thiab cov phev, tag nrho cov yam ntxwv ntawm tus me nyuam yog li ntawd twb txiav txim siab: xim ntawm nws ob lub qhov muag, nws cov plaub hau, lub puab tsaig ntawm lub qhov ntswg, thiab ntawm chav kawm, nws pw ua ke.

• Yog hais tias cov phev yog tus nqa ntawm X chromosome, tus me nyuam nqa tus XX khub: nws yuav yog ib tug ntxhais.
• Yog tias nws nqa Y chromosome, tus menyuam yuav muaj XY khub: nws yuav yog menyuam tub.

Kev sib deev ntawm tus me nyuam yog li ntawd nyob ntawm lub caij nyoog, nyob ntawm seb cov phev yuav ua tiav hauv fertilizing oocyte ua ntej.

Txij li lub lim tiam thib 6 ntawm cev xeeb tub, cov qe menyuam yaus raug muab tso rau hauv qhov chaw uas zes qe menyuam lossis cov qe ntshav yuav loj hlob tom qab. Tab sis txawm hais tias nws twb tau kho lawm, nyob rau theem no, kev sib deev ntawm tus menyuam hauv plab tseem tsis txawv. Hauv cov menyuam yaus, qhov noov tshwm sim thaum lub lim tiam 12 ntawm cev xeeb tub (14 WA - 3rd hli), thiab hauv cov ntxhais, qhov chaw mos pib tsim thaum lub lim tiam 20 ntawm cev xeeb tub (22 WA, 5th hli) (1). Nws yog vim li no thaum lub sij hawm cev xeeb tub thib ob ultrasound (morphological ultrasound ntawm 22 lub lis piam) nws muaj peev xwm paub qhov sib deev ntawm tus menyuam.

• txoj kev Shettles

Raws li kev ua haujlwm ntawm American biologist Landrum Brewer Shettles, tus sau ntawm Yuav Ua Li Cas Xaiv Koj Tus Me Nyuam2 (Yuav ua li cas xaiv tus txiv neej ntawm koj tus menyuam), cov phev nqa tus poj niam chromosome (X) nce mus qeeb dua thiab nyob ntev dua, thaum cov phev nqa tus txiv neej chromosome (Y) nce nrawm dua tab sis muaj sia nyob luv dua. Lub tswv yim yog li ntawd los teem caij sib deev raws li qhov xav tau ntawm kev sib deev: mus txog 5 hnub ua ntej ovulation los txhawb cov phev resistant tshaj plaws thiaj li yuav muaj ib tug ntxhais; nyob rau hnub ntawm ovulation thiab ob hnub tom ntej los txhawb cov phev ceev tshaj plaws rau ib tug me nyuam tub. Rau qhov no yog ntxiv lwm cov lus qhia: pH ntawm lub ncauj tsev menyuam mucus (alkaline nrog ib tug baking soda qhov chaw mos douche rau ib tug me nyuam tub, acidic nrog ib tug vinegar da dej rau ib tug hluas nkauj), qhov tob thiab axis ntawm kev nkag mus, muaj ib tug poj niam orgasm los yog tsis, thiab lwm yam. Dr. Shettles qhia txog 75% kev vam meej… tsis muaj pov thawj scientific. Tsis tas li ntawd, txoj kev tshuaj xyuas cov phev tshiab tau pom tias tsis muaj qhov sib txawv hauv lub cev los yog kev ceev ntawm kev txav ntawm X lossis Y phev (3).

• txoj kev txiv

Raws li kev tshawb fawb (4) tau ua nyob rau xyoo 80s ntawm Port-Royal maternity tsev kho mob ntawm 200 tus poj niam cev xeeb tub, txoj kev no tau tsim los ntawm Dr François Papa thiab muab rau cov pej xeem hauv ib phau ntawv (5). Nws yog raws li kev noj zaub mov uas muab qee cov ntxhia ntsev hauv cov ntsiab lus zoo raws li kev sib deev xav tau. Kev noj zaub mov nplua nuj nyob hauv calcium thiab magnesium yuav hloov kho qhov chaw pH ntawm tus poj niam, uas yuav thaiv kev nkag mus ntawm Y spermatozoa rau hauv lub qe, thiab yog li tso cai rau muaj ib tug ntxhais. Hloov pauv, kev noj zaub mov nplua nuj nyob rau hauv sodium thiab potassium yuav thaiv kev nkag ntawm X phev, ua kom muaj feem yuav muaj menyuam. Qhov kev noj zaub mov nruj heev no yuav tsum tau pib tsawg kawg 2 thiab ib nrab lub hlis ua ntej xeeb tub. Tus sau tso rau pem hauv ntej qhov kev vam meej ntawm 87%, tsis tau tshawb pom tseeb.

Ib txoj kev tshawb fawb (6) tau ua thaum xyoo 2001 thiab 2006 ntawm 173 tus poj niam tau kawm txog qhov ua tau zoo ntawm kev noj zaub mov ionic nrog rau kev teem sijhawm ntawm kev sib deev raws li hnub ntawm ovulation. Ua kom raug siv thiab ua ke, ob txoj kev muaj 81% kev ua tiav, piv rau tsuas yog 24% yog tias ib qho lossis ob txoj hauv kev ua tsis raug.