Vim li cas cov poj niam tsis suav tias yog Hemizygous?
Vim li cas cov poj niam tsis suav tias yog Hemizygous?

Video: Vim li cas cov poj niam tsis suav tias yog Hemizygous?

Video: Vim li cas cov poj niam tsis suav tias yog Hemizygous?
Video: 26 /10/2019 vim li cas poj niam muaj txiv lawm pheej deev hluas nraug 2024, Kaum ib hlis
Anonim

Vim poj niam muaj ob daim ntawv theej ntawm X chromosome, thaum txiv neej tsuas muaj ib qho (lawv yog hemizygous ), cov kab mob tshwm sim los ntawm cov noob ntawm X chromosome, feem ntau yog X-txuas rov qab, feem ntau cuam tshuam rau txiv neej.

Ntawm no, cov poj niam Hemizygous?

Poj niam yog XX. Txiv neej yog XY. Txij li cov txiv neej tsuas muaj ib daim qauv ntawm X chromosome xwb, lawv tsuas muaj ib qho allele rau ib lub noob ntawm X chromosome. Txiv neej hais tias " hemizygous " rau ib qho X-chromosome noob, txhais tau hais tias tsuas muaj ib nrab ("hemi") ntau li alleles li ib txwm muaj rau tus neeg diploid.

Tsis tas li ntawd, vim li cas cov poj niam muaj Barr lub cev? A Barr lub cev (lub npe tom qab tus neeg nrhiav pom Murray Barr ) yog qhov tsis ua haujlwm X chromosome hauv a poj niam somatic cell, rendered inactive nyob rau hauv ib tug txheej txheem hu ua lyonization, nyob rau hauv cov hom ntawm kev sib deev yog txiav txim los ntawm lub xub ntiag ntawm tus Y (xws li tib neeg) los yog W chromosome es tsis yog lub diploidy ntawm lub X.

Ib yam li ntawd, Hemizygous mob yog dab tsi?

Hemizygous yog a mob nyob rau hauv uas tsuas yog ib daim qauv ntawm cov noob los yog DNA ib ntus muaj nyob rau hauv cov hlwb diploid. Txiv neej yog hemizygous rau feem ntau cov noob ntawm kev sib deev chromosomes, tsuas muaj ib qho X thiab ib qho Y chromosome.

Puas yog homozygous dominant?

Lub cev muaj peev xwm ua tau homozygous tseem ceeb , yog tias nws nqa ob daim ntawv tib yam tseem ceeb allele, lub homozygous recessive, yog hais tias nws nqa ob daim ntawv luam ntawm tib recessive allele. Heterozygous txhais tau hais tias ib tug kab mob muaj ob tug sib txawv alleles ntawm ib tug noob. Cov neeg nrog CF yog homozygous rov ua dua.

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