Muaj pes tsawg cov noob tswj tus nplaig dov?

Video: Muaj pes tsawg cov noob tswj tus nplaig dov?

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

Qhov no tsis txhais hais tias nplaig dov tsis muaj caj ces "kev cuam tshuam," McDonald hais. Ntau tshaj ib noob tuaj yeem pab txhawb nplaig - dov peev xwm. Tej zaum tib yam noob uas txiav txim tus lus qhov ntev lossis cov leeg nqaij muaj feem cuam tshuam. Tab sis tsis muaj ib qho tseem ceeb noob uas yog lub luag haujlwm.

Kuj nug tias, muaj pes tsawg tus neeg tuaj yeem yob lawv tus nplaig?

Qhov kev faib ua feem ntawm cov neeg uas tuaj yeem yob lawv tus nplaig yog nyob ntawm 65 rau 81 feem pua, nrog ib tug me ntsis ntawm tus nplaig-rollers nyob rau hauv cov poj niam tshaj li cov txiv neej (Sturtevant 1940, Urbanowski thiab Wilson 1947, Liu thiab Hsu 1949, Komai 1951, Lee 1955).

Ib sab saum toj no, dov nplaig txhais li cas? Tus nplaig dov yog tus muaj peev xwm yob lub lateral ntug ntawm lub nplaig nce mus rau hauv ib lub cev. Cov lus cov leeg ntawm sab hauv tso cai rau qee tus neeg ua lawv lus rau hauv cov duab tshwj xeeb. Kev ntseeg nrov tuav qhov kev hloov pauv hauv lub peev xwm no yog cov qhov tshwm sim ntawm cov noob caj noob ces.

Ntawm no, txhua tus tuaj yeem yob lawv tus nplaig?

Txhua tus paub ib txhia neeg tuaj yeem yob lawv tus nplaig thiab ib co ua tau 't-thiab tias lub peev xwm tau txais los ntawm ib tus niam txiv. Nws tau pom tias kwv yees li 70 feem pua ntawm cov menyuam ntxaib sib npaug sib koom nplaig - dov qhov zoo. “Yog nplaig dov yog cov noob caj noob ces zoo tib yam, cov menyuam ntxaib yuav zoo ib yam.

Puas yog allele rau tus nplaig dov dominant lossis recessive?

Tus nplaig dov muaj peev xwm yuav yog vim muaj ib lub noob muaj peev xwm yob tus nplaig ib tseem ceeb qhov zoo thiab qhov tsis muaj nplaig dov peev a rov ua dua qhov zoo. Txawm li cas los xij, muaj qee lo lus nug txog qhov qub txeeg qub teg ntawm nplaig dov . Cov kev tshawb fawb tsis ntev los no tau pom tias nyob ib ncig ntawm 30% ntawm cov menyuam ntxaib zoo tib yam tsis qhia qhov zoo.

Pom zoo:

Dab tsi yog txhais los ntawm cov noob tseem ceeb thiab cov noob caj noob ces?

(Nyob rau hauv cov ntsiab lus ntawm caj ces, ib qho tseem ceeb tshaj plaws yog ib qho uas yog phenotypically qhia hauv heterozygotes). Ib qho tseem ceeb tshaj plaws yog tawm tsam qhov tsis zoo uas tshwm sim tsuas yog thaum muaj ob daim ntawv theej ntawm cov noob. (Nyob rau hauv cov ntsiab lus genetic, ib tug recessive zoo yog ib tug uas yog phenotypically qhia tsuas yog nyob rau hauv homozygotes)

Lub sijhawm twg S tuaj yeem tswj hwm cov noob caj noob ces?

Eukaryotic gene qhia yog tswj thaum lub sij hawm transcription thiab RNA ua, uas tshwm sim nyob rau hauv lub nucleus, thiab thaum lub sij hawm lub protein txhais lus, uas tshwm sim nyob rau hauv lub cytoplasm. Cov kev cai ntxiv tuaj yeem tshwm sim los ntawm kev hloov pauv tom qab kev hloov pauv ntawm cov protein

Hom kev hloov pauv li cas yog tus nplaig dov?

Tus nplaig dov yog ib qho piv txwv ntawm kev hloov pauv tsis tu ncua: koj tuaj yeem yob koj tus nplaig lossis koj ua tsis tau. Lwm cov yam ntxwv, piv txwv li qhov siab thiab qhov hnyav, qhia qhov sib txawv tsis tu ncua. Cov neeg tuaj nyob rau hauv tag nrho cov duab thiab ntau thiab tsawg

Yuav ua li cas muaj pes tsawg tus noob sib xyaw ua tau hauv gamete ntau lawm rau Dihybrid cross Vim li cas thiaj muaj ntau?

Muaj peev xwm gametes rau txhua tus niam txiv AaBb Txij li thaum txhua tus niam txiv muaj plaub qhov sib txawv ntawm cov alleles hauv gametes, muaj kaum rau kev sib txuas ua ke rau tus ntoo khaub lig no