Muaj pes tsawg chromosomes muaj chromatid?

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Cov ntsiab lus tseem ceeb yog

Video: Muaj pes tsawg chromosomes muaj chromatid?

2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36

Ib yam li ntawd, hauv tib neeg (2n = 46 ), muaj 46 chromosome ua tam sim no thaum metaphase, tab sis 92 chromatids. Nws tsuas yog thaum tus muam chromatids sib cais - ib kauj ruam qhia tias anaphase tau pib - tias txhua tus chromatid raug suav tias yog ib tus neeg chromosome.

Ib yam li ntawd, muaj pes tsawg chromatids nyob hauv ib chromosome?

ob chromatids

Ib tug kuj yuav nug, yog chromatid yog chromosome? A chromatid (Greek khrōmat- 'xim' + -id) yog ib chromosome uas tau luam tawm tshiab los yog cov ntawv luam ntawm xws li a chromosome , ob leeg tseem koom ua tus thawj chromosome los ntawm ib tug centromere. Ua ntej replication, ib tug chromosome yog tsim los ntawm ib tug DNA molecule.

Ib yam li ntawd, pes tsawg chromatids puas muaj chromosome ua ntej DNA replication?

ob chromatids

Koj suav chromatids li cas?

Cov ntsiab lus tseem ceeb yog

Tus naj npawb ntawm chromosomes = suav cov centromeres.
Tus naj npawb ntawm DNA molecule = suav tus naj npawb ntawm chromatids.
Tus naj npawb ntawm DNA molecule nce tsuas yog thaum DNA replicates uas nyob rau hauv S theem ntawm lub voj voog ntawm tes.
Tus naj npawb ntawm DNA molecules txo qis thaum lub cell faib,

Pom zoo:

Muaj pes tsawg chromosomes nyob rau hauv ib tug kab mob cell?

Feem ntau cov kab mob muaj ib los yog ob lub voj chromosomes

Lub cev muaj pes tsawg chromosomes?

Tib neeg muaj 23 khub ntawm chromosomes, rau tag nrho ntawm 46 chromosomes. Qhov tseeb, txhua hom nroj tsuag thiab tsiaj txhu muaj tus lej ntawm chromosomes. Piv txwv li, cov txiv hmab txiv ntoo yoov muaj plaub khub ntawm chromosomes, thaum cog nplej muaj 12 thiab aub, 39

Cov txiv neej thiab poj niam muaj pes tsawg tus X thiab Y chromosomes?

Cov poj niam muaj ob daim qauv ntawm X chromosome, thaum txiv neej muaj ib qho X thiab ib qho Y chromosome. 22 autosomes yog suav nrog qhov loj me. Lwm ob chromosomes, X thiab Y, yog kev sib deev chromosomes. Daim duab no ntawm tib neeg chromosomes lined ua khub yog hu ua karyotype