Video: Vim li cas chimps muaj 48 chromosomes thiab tib neeg 46?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Tib neeg muaj 46 chromosomes , hos chimpanzee , gorilla, thiab orangutan muaj 48 . Qhov sib txawv karyotypic loj no tau tshwm sim los ntawm kev sib xyaw ntawm ob tus poj koob yawm txwv chromosomes ua form tib neeg chromosome 2 thiab tom qab inactivation ntawm ib qho ntawm ob qhov qub centromeres (Yunis thiab Prakash 1982).
Yog li ntawd, vim li cas cov gorillas muaj 48 chromosomes?
Tib neeg muaj ib tug yam ntxwv diploid chromosome tus naj npawb ntawm 2N = 46 whereas lwm Great Apes (orangutans, gorillas , thiab chimps) tag nrho 2N = 48 . Qhov loj metacentric Chromosome 2 ntawm Homo zoo li yog qhov tshwm sim ntawm kev sib xyaw ntawm ob lub me me telocentric chromosomes pom nyob rau hauv lwm lub Great Apes.
Qhov thib ob, puas yog apes thiab tib neeg muaj tib tus lej ntawm chromosomes? Tib neeg thiab chromosomes ntawm chimpanzee zoo sib xws heev. Thawj qhov txawv yog qhov ntawd tib neeg muaj ib tug ob peb ntawm chromosomes tshaj ua lwm yam zoo heev apes . Tib neeg muaj 23 sib chromosomes thiab lwm yam zoo heev apes muaj 24 sib chromosomes.
Tsuas yog li ntawd, tib neeg tau txais 46 chromosomes li cas?
Tib neeg , zoo li ntau lwm hom, hu ua 'diploid'. Qhov no yog vim peb chromosomes muaj nyob rau hauv kev sib piv - nrog ib tug chromosome ntawm txhua tus khub tau txais los ntawm txhua tus niam txiv lom. Txhua lub cell hauv lub tib neeg lub cev muaj 23 khub ntawm xws li chromosomes ; peb tus lej diploid yog li ntawd 46 , peb 'haploid' naj npawb 23.
Dab tsi yog vim li cas rau qhov sib txawv ntawm cov chromosomes ntawm tib neeg thiab poj apes?
Tshwj xeeb, nws piav txog qhov ntawd tib neeg muaj ib tug tsawg dua chromosome khub hauv lawv cov hlwb dua apes , vim muaj kev hloov pauv hauv tus lej chromosome 2 uas ua rau ob chromosomes mus fuse ib leeg.
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