Thaum tus txiv neej haemophilic (XhY) yuav poj niam nqa khoom (XXh), ces 50% cov ntxhais yog cov nqathiab 50% haemophilic.
Thaum tus poj niam muaj kab mob haemophilic yuav ib tug txiv neej?
Nws tsuas yog qhia yog tias tus poj niam ua ke yog ob npaug. Cov xeeb leej xeeb ntxwv yog 50% poj niam uas tawm ntawm 2 tus ntxhais yog tus nqa thiab ib tus zoo li qub. Thiab nyob rau hauv cov ntaub ntawv ntawm cov tub, ib tug yog ib txwm thiab ib tug yog mob. Yog li lo lus teb raug yog (D) 50% cov tub yuav muaj haemophilia.
Yuav ua li cas yog cov xeeb ntxwv ntawm cov xeeb ntxwv thaum ib tug txiv neej ib txwm yuav poj niam hemophilic piav qhia nrog Ray Digram nkaus xwb?
Txiv neej nrog XY khub ntawm kev sib deev chromosome, uas txhais tau tias yuav txiv neej noj qab haus huv. Thiab txiv neej nrog XY chromosome khub yuav tsis kis los ntawm hemophilia. Yog li, peb tuaj yeem xaus tias tag nrho cov xeeb ntxwv yuav yog qhov qub. Thiab kev xaiv 'D' yog cov lus teb raug.
Yuav ua li cas yog tias lawv tus ntxhais yuav mob haemophilic?
Tus txiv neej haeomophilic yuav ib tug poj niam homozygous. Dab tsi yog qhov tshwm sim uas lawv tus ntxhais yuav haemophilic? Yog li, qhov tshwm sim muaj tus ntxhais hemophilic yuav yog 0%.
Qhov tshwm sim yog dab tsi uas haemophilic?
tag nrho, muaj 1 ntawm 4 (25%) rau txhua qhov cev xeeb tub uas tus menyuam yuav yog tus tub nrog hemophilia thiab muaj 1 ntawm 4 (25%) tus me nyuam yuav yog ib tug ntxhais heterozygous.
