Video: Dab tsi yog qhov txawv ntawm chromosomes chromatids thiab homologous chromosomes?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Nws yog ib qho tseem ceeb kom nco ntsoov cov qhov sib txawv ntawm tus muam chromatids thiab homologous chromosomes . Muam chromatids yog siv nyob rau hauv cell division, zoo li hauv cell hloov, whereas homologous chromosomes yog siv nyob rau hauv kev faib ua me nyuam, xws li ua ib tug neeg tshiab. Muam chromatids yog genetic tib yam.
Kuj tseem paub yog, qhov txawv ntawm chromosomes thiab homologous chromosomes yog dab tsi?
Kev piav qhia: Txawm hais tias ob qho tib si zoo sib xws, cov qhov sib txawv ntawm ob leeg yog kev sib tw. Homologous chromosomes yeej yog ob yam zoo sib xws chromosomes tau los ntawm leej txiv thiab leej niam. Lawv yog homologous vim lawv muaj tib cov noob, txawm tsis yog tib alleles.
Tsis tas li ntawd, puas yog chromosome ib lossis ob chromatids? Tom qab replication, txhua chromosome yog tsim los ntawm ob DNA molecules; nyob rau hauv lwm yam lus, DNA replication nws tus kheej nce tus nqi ntawm DNA tab sis tsis (tseem) nce tus naj npawb ntawm chromosomes . Cov ob zoo tib yam luam-txhua txoj kev ib ib nrab ntawm cov replicated chromosome - npe chromatids.
Homologous chromosomes yog dab tsi?
Homologous chromosomes yog ua los ntawm chromosome khub ntawm kwv yees li qhov ntev, txoj hauj lwm centromere, thiab staining qauv, rau cov noob nrog tib loci sib raug. Alleles nyob rau hauv homologous chromosomes tej zaum yuav txawv, ua rau txawv phenotypes ntawm tib cov noob.
Tus muam chromatids puas yog chromosome?
Ob daim ntawv luam ntawm a chromosome hu ua tus muam chromatids . Cov tus muam chromatids yog zoo tib yam rau ib leeg thiab txuas rau ib leeg los ntawm cov proteins hu ua cohesins. Ntev npaum li qhov tus muam chromatids txuas nrog ntawm centromere, lawv tseem suav tias yog ib qho chromosome.
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