Yuav ua li cas mus tsis ncaj ncees lawm nrog hla?
Yuav ua li cas mus tsis ncaj ncees lawm nrog hla?

Video: Yuav ua li cas mus tsis ncaj ncees lawm nrog hla?

Video: Yuav ua li cas mus tsis ncaj ncees lawm nrog hla?
Video: yog yuav lwm tus ces mag xwb hhh 2024, Kaum ib hlis
Anonim

1 Teb. Yog hla dhau tsis tshwm sim thaum meiosis, muaj yuav yog tsawg genetic variation nyob rau hauv ib hom. Kuj hom ua tau tuag vim muaj kab mob thiab tej kev tiv thaiv tau txais yuav tuag nrog tus kheej.

Raws li qhov tshwm sim ntawm kev hla dhau yog dab tsi?

Nws tshwm sim thaum meiosis. Hla mus yog kev sib pauv ntawm chromosome ntu ntawm cov uas tsis yog-viv ncaus chromatids thaum lub sij hawm tsim gametes. Cov nyhuv yog los sib sau ua ke (shuffle) cov alleles ntawm niam txiv chromosomes, kom cov gametes muaj kev sib txuas ntawm cov noob sib txawv ntawm leej niam leej txiv.

Kev hla dhau ntau npaum li cas? Hla mus yog kwv yees li tshwm sim kwv yees li tsib caug-tsib zaug hauv meiosis hauv cov txiv neej, thiab txog xya caum-tsib zaug hauv meiosis hauv poj niam.

Kuj tseem yuav paub, dab tsi ua rau tsis sib xws?

Kev hla tsis sib xws yog hom kev sib tw ntawm cov noob caj noob ces lossis tshem tawm cov xwm txheej uas tshem tawm ib ntu hauv ib txoj hlua thiab hloov nws nrog kev sib tw ntawm nws tus viv ncaus chromatid hauv mitosis lossis los ntawm nws cov chromosome homologous thaum lub sij hawm meiosis. Feem ntau cov noob yog lub luag haujlwm rau qhov tshwm sim ntawm hla dhau.

Dab tsi yog qhov tseem ceeb heev txog kev hla hla thiab thaum twg nws tshwm sim?

Hla Hla . Chromosomal hla dhau yog ib qho ntawm cov xwm txheej tseem ceeb tshaj plaws uas tshwm sim Thaum lub sij hawm gametogenesis - zus tau tej cov gametes (sperm thiab qe nyob rau hauv tib neeg). Yog hla dhau ua tsis yog tshwm sim , tom qab ntawd txhua ntawm plaub lub hlwb haploid tsim thaum lub sij hawm meiosis yuav nqa tib cov alleles raws li muaj nyob rau hauv niam txiv.

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