Dab tsi yog thaj tsam ntawm DNA hauv chromosome hu ua?
Dab tsi yog thaj tsam ntawm DNA hauv chromosome hu ua?

Video: Dab tsi yog thaj tsam ntawm DNA hauv chromosome hu ua?

Video: Dab tsi yog thaj tsam ntawm DNA hauv chromosome hu ua?
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Teb thiab piav qhia: Chromosomes txhua muaj cheeb tsam ntawm DNA hu ua noob. Cov noob muaj cov ntaub ntawv hais txog dab tsi peb muaj.

Tsis tas li ntawd, qhov txawv ntawm chromosomes yog dab tsi?

Cov ntu ntawm a chromosome yog Centromere, Kinetochores, Telomeres thiab ib khub niam txiv Chromatids. Cov chromatids tau muab faib ua "p" caj npab thiab "q" caj npab. (P caj npab yog luv dua). Lub centromere yog ib feem uas txuas ob chromatids ua ke nyob rau hauv ib tug X duab.

Ib yam li ntawd, dab tsi yog qhov uas ua rau DNA eukaryotic chromosome? Txhua chromosome muaj enormously ntev linear DNA molecule txuam nrog cov proteins uas quav thiab ntim cov xov zoo ntawm DNA mus rau hauv ib tug ntau compact qauv. Lub nucleosome muaj xws li a DNA ob chav helix khi rau ib qho octamer ntawm cov tub ntxhais histones (2 dimers ntawm H2A thiab H2B, thiab H3 / H4 tetramer).

Ib yam li ntawd, thaj tsam condensed tshaj plaws ntawm chromosome yog dab tsi?

Centromere: Cov feem ntau condensed thiab constricted thaj tsam ntawm chromosome uas cov spindle fiber txuas thaum lub sij hawm mitosis.

DNA thiab chromosome yog dab tsi?

Nyob rau hauv lub nucleus ntawm txhua cell, lub DNA molecule yog ntim rau hauv xov zoo li cov qauv hu ua chromosomes . Txhua chromosome yog ua los ntawm DNA nruj nreem coiled ntau zaus nyob ib ncig ntawm cov proteins hu ua histones uas txhawb nqa nws cov qauv. DNA thiab histone proteins tau ntim rau hauv cov qauv hu ua chromosomes.

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