Qhov piv txwv xaiv stabilizing yog dab tsi?
Qhov piv txwv xaiv stabilizing yog dab tsi?

Video: Qhov piv txwv xaiv stabilizing yog dab tsi?

Video: Qhov piv txwv xaiv stabilizing yog dab tsi?
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Stabilizing xaiv nyob rau hauv evolution yog ib hom ntawm ntuj xaiv uas nyiam cov neeg nruab nrab hauv cov pej xeem. Classic piv txwv ntawm qhov zoo uas tshwm sim los ntawm ruaj khov xaiv suav nrog tib neeg qhov hnyav yug, tus naj npawb ntawm cov xeeb ntxwv, camouflage lub tsho tiv no xim, thiab cactus spine ceev.

Yog li ntawd, dab tsi yog ib qho piv txwv ntawm stabilizing xaiv hauv biology?

Hauv tib neeg, qhov hnyav thaum yug yog ib qho piv txwv ntawm stabilizing xaiv . Cov menyuam mos uas yug me me tuaj yeem poob cua sov yooj yim heev thiab tuaj yeem tuag, qhov uas cov menyuam yug los loj dhau tuaj yeem ua rau muaj teeb meem thaum yug menyuam thiab tuag ntawm leej niam lossis tus menyuam.

Qhov thib ob, dab tsi yog qhov ua rau muaj kev ruaj ntseg xaiv? Feem ntau ua rau kev ruaj ntseg xaiv Qee qhov feem ntau feem ntau cov ntaub ntawv ntawm xaiv yog los ntawm predation, kev faib peev txheej, xim ntawm ib puag ncig, hom zaub mov, thiab ntau yam ntawm lwm yam quab yuam.

Tsis tas li lo lus nug yog, txhais tau li cas los ntawm kev xaiv ruaj khov?

Stabilizing xaiv (tsis txhob totaub nrog qhov tsis zoo los yog ua kom huv xaiv ) yog hom ntuj xaiv uas cov pejxeem txhais tau tias stabilizes ntawm ib qho tshwj xeeb uas tsis yog qhov zoo tshaj tus nqi. Qhov no txhais tau tias uas feem ntau phenotype nyob rau hauv cov pejxeem yog xaiv rau thiab tseem yuav kav rau tiam tom ntej.

Dab tsi yog qhov sib txawv ntawm kev sib npaug thiab kev xaiv ruaj khov?

1 Teb. Feem ntau, Stabilizing xaiv yog ib lub tswv yim uas siv rau phenotypic zoo thaum sib npaug xaiv yog ib lub tswv yim uas siv rau qhov chaw muab. Sib npaug xaiv tuaj yeem yog vim qhov tsis zoo-zaus dependence xaiv los yog vim overdominance (= heterozygous kom zoo dua ntawm ib qho chaw).

Pom zoo: