Video: Puas yog cov noob tseem ceeb ib txwm qhia?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Kev piav qhia: Alleles uas nthuav tawm tiav kev tswj hwm yuav ib txwm ua qhia nyob rau hauv lub cell phenotype. Txawm li cas los xij, qee zaum kev tswj hwm ntawm ib qho allele tsis tiav. Nyob rau hauv tas li ntawd, yog hais tias ib tug cell muaj ib tug tseem ceeb thiab ib rov ua dua allele (piv txwv li heterozygous), lub cell tuaj yeem pom cov phenotypes nruab nrab.
Ib yam li ntawd ib tug yuav nug, puas cov noob caj noob ces yeej ib txwm dominant?
Dominant tsis yog Ib txwm Feem ntau. Ib qho ntawm thawj yam uas peb tau qhia hauv cov noob caj noob ces yog qee qhov zoo tseem ceeb thiab lwm tus yog recessive. Thiab qhov ntawd tseem ceeb qhov zoo trump cov recessive sawv daws yuav. Seb puas los yog tsis yog ib qho zoo ib yam yuav tsum tau ua nrog pes tsawg daim ntawv ntawd noob version (los yog allele) yog nyob rau hauv cov pejxeem.
Tsis tas li ntawd, hom gene twg yog ib txwm qhia? cov ntsiab lus ntawm caj ces
| Lub sij hawm | Txhais |
|---|---|
| cov gene | ib tug gene uas ib txwm qhia, uas yog ncaj qha detectable nyob rau hauv tus neeg |
| recessive noob | ib tug gene uas tsuas yog qhia thaum ob zoo tib yam coding coding rau tib yam zoo muaj, ib tug los ntawm leej niam, ib tug los ntawm leej txiv. |
Ib yam li ntawd, yuav ua li cas hais txog cov noob caj noob ces?
A tseem ceeb allele yog denoted los ntawm ib tsab ntawv loj (A piv rau a). Txij li thaum txhua tus niam txiv muab ib qho allele, qhov ua tau ua ke yog: AA, Aa, thiab aa. Cov xeeb ntxwv uas nws genotype yog AA lossis Aa yuav muaj tus yam ntxwv tseem ceeb qhia phenotypically, thaum aa cov tib neeg qhia tus rov zoo li qub.
Puas yog cov noob caj ces ib txwm qhia?
Rov qab alleles yog sau los ntawm tsab ntawv me (ib piv A). Tsuas yog cov tib neeg uas muaj genotype yuav qhia ib rov zoo li qub ; yog li ntawd, cov xeeb ntxwv yuav tsum tau txais ib qho recessive allele los ntawm txhua tus niam txiv los nthuav qhia a rov zoo li qub.
Pom zoo:
Dab tsi yog qhov tseem ceeb ntawm cov noob caj noob ces rau kev loj hlob ntawm fetal?
Kev soj ntsuam ntawm lub luag haujlwm ntawm chromosomes hauv tib neeg txoj kev loj hlob thiab kev loj hlob ntawm lub fetus tau mob siab rau qhov txawv txav ntawm chromosomal. Cov noob muaj cov lus qhia rau kev loj hlob thiab kev loj hlob. Qee qhov kev hloov gene ua rau cov gene faulty kom cov lus nyeem tsis raug lossis tsis nyeem tag nrho los ntawm lub xovtooj ntawm tes
Dab tsi yog txhais los ntawm cov noob tseem ceeb thiab cov noob caj noob ces?
(Nyob rau hauv cov ntsiab lus ntawm caj ces, ib qho tseem ceeb tshaj plaws yog ib qho uas yog phenotypically qhia hauv heterozygotes). Ib qho tseem ceeb tshaj plaws yog tawm tsam qhov tsis zoo uas tshwm sim tsuas yog thaum muaj ob daim ntawv theej ntawm cov noob. (Nyob rau hauv cov ntsiab lus genetic, ib tug recessive zoo yog ib tug uas yog phenotypically qhia tsuas yog nyob rau hauv homozygotes)
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Puas yog Blonde yog ib qho tseem ceeb lossis cov noob caj noob ces?
Cov noob caj noob ces ntawm cov xim plaub hau tseem tsis tau ruaj khov. Raws li ib txoj kev xav, tsawg kawg yog ob lub noob caj noob ces tswj tib neeg cov plaub hau xim. Ib qho phenotype (xim av / xim daj) muaj lub ntsej muag xim av thiab lub ntsej muag daj daj. Ib tug neeg uas muaj xim av allele yuav muaj plaub hau xim av; ib tug neeg uas tsis muaj xim av alleles yuav blond