Poj niam muaj ob X chromosomes, hos txiv neej muaj ib X thiab ib Y chromosome. Thaum ntxov nyob rau hauv embryonic txoj kev loj hlob nyob rau hauv cov poj niam, ib tug ntawm ob lub X chromosomes yog randomly thiab mus tas li inactivated nyob rau hauv lub hlwb uas tsis yog qe qe. Qhov tshwm sim no hu ua X-inactivation lossis lyonization.
YYYA yog dab tsi?
Males nrog XYY syndrome muaj 47 chromosomes vim yog Y chromosome ntxiv. Cov mob no kuj qee zaum hu ua Jacob's syndrome, XYY karyotype, lossis YY syndrome. Raws li National Institutes of He alth, XYY syndrome tshwm sim hauv 1 ntawm txhua 1,000 tus tub.
Koj puas tuaj yeem yog ib tug ntxhais nrog XY chromosome?
X thiab Y chromosomes hu ua "sex chromosomes" vim tias lawv pab txhawb kev sib deev ntawm tus neeg. Feem ntau cov txiv neej muaj XY chromosomes thiab cov poj niam feem ntau muaj XX chromosomes. Tab sis muaj cov ntxhais thiab cov poj niam uas muaj XY chromosomes. Qhov no tuaj yeem tshwm sim, piv txwv li, thaum tus ntxhais muaj androgen insensitivity syndrome.
Tus lej chromosome twg yog poj niam?
Poj niam muaj ob X chromosomes, thaum txiv neej muaj ib X thiab ib tug Y chromosome. Ib daim duab ntawm tag nrho 46 chromosomes hauv lawv cov khub yog hu ua karyotype. Ib tug poj niam karyotype yog sau 46, XX, thiab ib txwm txiv neej karyotype sau 46, XY.
Leej twg muaj noob caj noob ces txiv neej los poj niam?
tib neeg genome
Txiv neej thiab poj niam muaj kev xyaum tib yam li ntawm 20,000 genes. Qhov sib txawv ntawm lub cev nkaus xwb hauv lawv cov caj ces yog nyob rau hauv kev sib deev chromosomes. Tsuas yog txiv neej muaj Y chromosome. Txawm hais tias X chromosome muaj nyob rau hauv ob qho tib si poj niam txiv neej, muaj ob daim ntawv luam ntawm cov poj niam thiab tsuas yog ib tug txiv neej.
