Video: Cov txiv neej puas muaj X lossis Y chromosomes?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
No. ntawm noob: 63 (CCDS)
Tom qab ntawd, dab tsi ob chromosomes txiv neej muaj rau poj niam txiv neej?
Nyob rau hauv no system, kev sib deev ntawm ib tug neeg yog txiav txim los ntawm ib tug khub ntawm kev sib deev chromosomes . Cov poj niam feem ntau muaj ob hom kev sib deev chromosome (XX), thiab hu ua homogametic deev. Cov txiv neej feem ntau muaj ob hom sib txawv kev sib deev chromosomes (XY), thiab hu ua heterogametic deev.
Tsis tas li ntawd, puas yog X thiab Y chromosomes homologous? Hauv tib neeg. Tib neeg muaj tag nrho ntawm 46 chromosomes , tab sis tsuas muaj 22 khub ntawm homologous autosomal ua chromosomes . Ntxiv 23rd khub yog poj niam txiv neej chromosomes , X thiab Y . Yog khub no yog ua los ntawm ib tug X thiab Y chromosome , ces tus khub chromosomes tsis yog homologous vim lawv qhov loj thiab cov ntsiab lus ntawm noob txawv heev
Tib neeg kuj nug, nyob rau theem twg yog poj niam txiv neej txiav txim?
Ib tug neeg fetus tsis tsim nws cov kab mob sib deev sab nraud kom txog rau thaum xya lub lis piam tom qab fertilization. Cov fetus zoo nkaus li kev sib deev tsis muaj kev xav, saib tsis zoo li txiv neej lossis poj niam. Tshaj li tsib lub lis piam tom ntej no, tus fetus pib tsim cov tshuaj hormones uas ua rau nws cov kab mob sib deev loj hlob mus rau txiv neej lossis poj niam lub cev.
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Cov tsib poj niam txiv neej no suav nrog txiv neej , poj niam , hermaphrodite , poj niam pseudohermaphrodites (cov neeg uas muaj zes qe menyuam thiab ib co txiv neej genitalia tab sis tsis muaj testes), thiab txiv neej pseudohermaphrodites (cov tib neeg uas muaj cov qog thiab qee qhov poj niam genitalia tab sis tsis muaj zes qe menyuam ).
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