Cov txheej txheem:
- Puas muaj kev tsis sib haum xeeb tshwm sim hauv txiv neej lossis poj niam?
- Nyob rau hauv leej niam leej txiv thiab meiotic faib tsis tau tshwm sim?
- Puas yog Down syndrome niam lossis txiv tsis muaj kev cuam tshuam?
- Qhov tsis muaj kev cuam tshuam tshwm sim rau Turner's syndrome?
Video: Tus niam txiv twg tsis muaj kev sib cav tshwm sim?
2024 Tus sau: Fiona Howard | [email protected]. Kawg hloov kho: 2024-01-10 06:38
Yog li ntawd, kev tsis sib haum xeeb yuav tsum tshwm sim hauv leej niam. Nco ntsoov tias thaum lub sij hawm meiosis kuv, muab tsis muaj crossover ntawm cov noob thiab cov centromere, allelic lwm txoj kev sib cais ntawm ib leeg. Thaum lub sij hawm meiosis II, zoo tib yam alleles ntawm tus muam chromatids cais.
Puas muaj kev tsis sib haum xeeb tshwm sim hauv txiv neej lossis poj niam?
Txoj kev xav, kev tsis sib haum xeeb yuav tshwm sim hauv cov txiv neej thiab poj niam cov kab mobntawm thawj lossis thib ob meiotic faib thiab yuav ua rau muaj ntau yam tsis sib cais. hom hauv progeny.
Nyob rau hauv leej niam leej txiv thiab meiotic faib tsis tau tshwm sim?
Nondisjunction tshwm sim thaum homologous chromosomes (meiosis I) lossis tus muam chromatids (meiosis II) tsis caisthaum lub sijhawm meiosis.
Puas yog Down syndrome niam lossis txiv tsis muaj kev cuam tshuam?
Trisomy 21 lossis Down Syndrome (DS) yog ib qho ntawm cov chromosomal abnormalities feem ntau. Feem ntau ntawm tag nrho trisomy 21 yog tshwm sim los ntawm chromosomal nondisjunction tshwm sim thaum niam txiv meiotic division (∼90%).
Qhov tsis muaj kev cuam tshuam tshwm sim rau Turner's syndrome?
Nondisjunction tej zaum yuav tshwm sim thaum lub sij hawm meiosis I los yog meiosis II. Aneuploidy feem ntau ua rau muaj teeb meem loj xws li Turner Syndrome, ib qho monosomy uas cov poj niam yuav muaj tag nrho lossis ib feem ntawm X chromosome.
Pom zoo:
Vim li cas kev txwv tsis pub muaj kev sib tw tshwm sim?
Tsis muaj kev sib tw inhibition tshwm sim thaum tus inhibitor khi rau cov enzyme ntawm qhov chaw uas tsis yog qhov chaw nquag … Nyob rau tom kawg, tus inhibitor tsis tiv thaiv kev khi ntawm lub substrate rau lub enzyme. tab sis txaus hloov cov duab ntawm qhov chaw uas catalytic kev ua si tshwm sim los tiv thaiv nws .
Puas muaj qhov sib txawv ntawm qhov tshwm sim thiab qhov tshwm sim?
Raws li lub npe qhov txawv ntawm qhov tshwm sim thiab qhov tshwm sim. yog happenchance is a coincidental happen while happenstance is (countable) a chance or random event or random events . Puas muaj lo lus tshwm sim? : a xwm txheej tshwj xeeb yog vim muaj caij nyoog Lawv tuaj ua ke los ntawm qhov tshwm sim .
Puas muaj kev sib cav uas tsis muaj zog thiab tsis muaj kev ntseeg?
Puas muaj kev sib cav uas tsis muaj zog thiab tsis muaj kev ntseeg? piav qhia: Txhua qhov kev sib cav uas tsis muaj zog kuj yuav tsis muaj kev sib cav, vim tias yuav muaj zog yog ib feem ntawm lub ntsiab lus ntawm kev sib cav . Puas muaj kev sib cav uas tsis muaj zog thiab paub?
Tsis tau tshwm sim lossis tsis tshwm sim?
The simple yav dhau los feem ntau yog tsim los ntawm daim ntawv preterite ntawm cov lus qhia ("Nws tshwm sim"), tab sis qee zaum rau qhov tseem ceeb, inversion ntawm - zoo li qhov no - negation, nws yog tsim nrog cov ntawv ua: "
Nyob rau hauv ib qho kev tsis sib haum xeeb pn kev sib tshuam cov kev sib tshuam tam sim no ntawm qhov sib npaug yog?
Nyob rau hauv qhov tsis ncaj ncees PN-kho qhov kev sib tshuam tam sim no ntawm qhov sib npaug yog zero, vim tias sib npaug tab sis cov neeg nqa khoom hla hla kev sib tshuam . Thaum pn kev sib tshuam tsis ncaj ncees qhov kev sib tshuam tam sim no ntawm qhov sib npaug yog?
