Video: Dab tsi yog qhov kev kuaj hla hauv cov noob caj noob ces?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Hauv noob caj noob ces , a xeem hla , thawj zaug qhia los ntawm Gregor Mendel, koom nrog kev yug me nyuam ntawm ib tug neeg nrog ib tug phenotypically recessive tus neeg, nyob rau hauv thiaj li yuav txiav txim lub zygosity ntawm lub qub los ntawm kev soj ntsuam proportions ntawm cov xeeb ntxwv phenotypes. Zygosity tuaj yeem yog heterozygous lossis homozygous.
Ntawm no, qhov kev xeem hla txhais li cas?
Kev kho mob txhais ntawm xeem : ib genetic ntoo khaub lig nruab nrab ntawm ib tug neeg homozygous recessive thiab ib tug coj xav tias heterozygote los txiav txim lub genotype ntawm tom kawg.
Ib sab saum toj no, qhov kev xeem hla thiab rov qab hla yog dab tsi? Hauv xeem hla , ib tug tseem ceeb phenotype yog hla nrog rau homologous recessive genotype nyob rau hauv thiaj li yuav cais tawm ntawm homologous dominant thiab heterozygous genotypes. Hauv rov qab ,f1 yog hla nrog ib tug ntawm cov niam txiv los yog caj ces zoo tib yam rau niam txiv.
Qhov thib ob, qhov kev xeem hla nrog piv txwv yog dab tsi?
Hauv ib xeem , tus neeg uas tsis paub genotype raug hla nrog homozygous recessive tus neeg (Daim duab hauv qab). Xav txog cov hauv qab no piv txwv : Piv txwv tias koj muaj paj liab thiab dawb thiab xim liab (P) yog qhov tseem ceeb rau dawb (p). A xeem yuav txiav txim siab lub cev lub genotype.
Test cross ratio yog dab tsi?
Qhov no 1: 1: 1: 1 phenotypic piv yog lub classic Mendelian piv rau a xeem hla nyob rau hauv uas lub alleles ntawm ob noob assort nws tus kheej mus rau hauv gametes (BbEe × bbee).
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)
Dab tsi yog qhov txawv ntawm kev xaiv khoom tsim thiab kev tsim noob caj noob ces?
Artificial xaiv xaiv rau cov yam ntxwv uas twb muaj nyob rau hauv ib hom, whereas genetic engineering tsim cov yam ntxwv tshiab. Hauv kev xaiv dag, cov kws tshawb fawb yug tsuas yog cov tib neeg uas xav tau qhov zoo. Los ntawm kev xaiv kev yug me nyuam, cov kws tshawb fawb muaj peev xwm hloov cov cwj pwm hauv cov neeg. Evolution tau tshwm sim
Yuav ua li cas cov khoom siv caj ces hauv txhua lub xov tooj tshiab tsim los ntawm kev faib tawm ntawm tes sib piv nrog cov khoom siv caj ces hauv lub xov tooj qub?
Mitosis tshwm sim nyob rau hauv ob lub nuclei uas zoo tib yam rau thawj nucleus. Yog li, ob lub hlwb tshiab tsim tom qab kev faib tawm ntawm tes muaj tib yam khoom siv caj ces. Thaum lub sij hawm mitosis, chromosomes condense los ntawm chromatin. Thaum saib nrog lub microscope, chromosomes pom nyob rau hauv lub nucleus
Dab tsi yog lub luag haujlwm ntawm cov noob caj noob ces thiab chromosomes hauv kev xeeb tub?
Heredity plays lub luag haujlwm tseem ceeb hauv kev loj hlob ntawm cov yam ntxwv thiab kis tau los ntawm cov noob. Cov yam ntxwv uas peb tau txais los pab txhim kho peb tus cwj pwm, txiav txim siab los ntawm khub niam txiv, ib qho los ntawm txhua tus niam txiv. Cov noob muaj nyob hauv cov qauv zoo li hu ua chromosomes, uas yog tsim los ntawm DNA