Qhov tshwm sim yog dab tsi uas lawv tus menyuam yuav muaj tus kabmob?
Qhov tshwm sim yog dab tsi uas lawv tus menyuam yuav muaj tus kabmob?

Video: Qhov tshwm sim yog dab tsi uas lawv tus menyuam yuav muaj tus kabmob?

Video: Qhov tshwm sim yog dab tsi uas lawv tus menyuam yuav muaj tus kabmob?
Video: Tshuaj theem vim li cas thiaj tau nqi ?/ Siv kho mob dab tsi?/paris polyphylla use for? 2024, Kaum ib hlis
Anonim

Feem ntau, yog ib tug niam txiv tsis yog ib carrier, ua qhov tshwm sim uas tus me nyuam yuav ua tus cab kuj yog: ½ zaug (tus qhov tshwm sim lwm tus niam txiv yog ib tus cab kuj). Uas yog, peb multiply qhov tshwm sim ntawm dhau ib kab mob allele, ½, zaug qhov tshwm sim uas niam txiv ua, qhov tseeb, nqa lub kab mob allele.

Ua raws li qhov no hauv kev txiav txim siab, qhov tshwm sim ntawm qhov qub txeeg qub teg yog dab tsi?

Cov qhov tshwm sim ntawm ib tsob nroj uas tau txais tus P lossis p allele los ntawm niam txiv heterozygous yog ½. Multiply Qhov yuav tshwm sim ntawm inheriting ob alleles mus nrhiav tus qhov tshwm sim tias ib tsob nroj yuav yog pp homozygote. Tsuas yog 25%, lossis ib qho txiaj ntsig ntawm plaub, yuav ua rau cov nroj tsuag homozygous rau xim paj dawb (pp).

Qhov thib ob, qhov tshwm sim yog dab tsi uas lawv cov menyuam tom ntej yuav muaj PKU? Yog hais tias lawv yog ob qho tib si heterozygous, ces ib feem peb ntawm lawv menyuam yuav muaj PKU , yog li ntawd probability uas lawv ua ntej tus me nyuam yuav muaj PKU yog 1/4, thiab qhov tshwm sim ntawm lawv ua heterozygous thiab ntawm lawv ua ntej tus menyuam muaj PKU 4/9 × 1/4 = 4/36 = 1/9, uas yog cov lus teb rau lo lus nug.

Ntawm no, cov kab mob dab tsi tuaj yeem kis los ntawm niam txiv mus rau lawv cov menyuam?

Genetic tej yam kev mob feem ntau hu ua hereditary vim lawv tuaj yeem kis los ntawm niam txiv mus rau lawv cov menyuam.

Piv txwv ntawm cov kab mob genetic muaj xws li:

  • qee cov qog nqaij hlav.
  • cystic fibrosis.
  • cov roj cholesterol siab.
  • hamophilia.
  • muscular dystrophy.
  • yug tsis xws luag (piv txwv li, spina bifida los yog cleft di ncauj).

Yuav ua li cas koj xam genetic probability?

Txij li thaum noob yog unlinked, cov no yog plaub yam kev ywj pheej, yog li peb ua tau xam ib qhov tshwm sim rau txhua tus thiab ces muab cov Qhov yuav tshwm sim kom tau qhov tshwm sim ntawm tag nrho cov txiaj ntsig. Cov qhov tshwm sim ntawm tau txais ib lossis ntau daim ntawv luam ntawm qhov tseem ceeb A allele yog 3/4 3/4 3/4.

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