Video: Dab tsi yog qhov tsis sib haum xeeb hauv evolution?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Tsis yog - random mating.
Hauv tsis yog - random mating , kab mob tej zaum yuav nyiam ua phooj ywg nrog lwm tus ntawm tib genotype los yog sib txawv genotypes. Tsis yog - random mating yuav tsis ua allele frequencies nyob rau hauv cov pej xeem hloov los ntawm nws tus kheej, tab sis nws muaj peev xwm hloov genotype zaus.
Tsis tas li ntawd, dab tsi yog lub ntsiab lus ntawm kev sib raug zoo tsis sib xws?
Kev sib deev tsis sib haum tshwm sim thaum lub qhov tshwm sim hais tias ob tug neeg nyob rau hauv ib tug pej xeem yuav sib yuav tsis zoo ib yam rau tag nrho cov ua tau khub ntawm cov tib neeg. Kev sib deev tsis sib haum muaj peev xwm ua tau ob hom: Inbreeding - cov tib neeg muaj feem yuav ua phooj ywg nrog cov txheeb ze ze (xws li lawv cov neeg nyob ze) dua nrog cov txheeb ze nyob deb.
Ib yam li ntawd, dab tsi yog qhov piv txwv ntawm kev sib tw tsis sib xws? Tsis sib haum xeeb . Yog tias cov tib neeg tsis sib haum xeeb nrog lwm tus neeg hauv cov pej xeem, piv txwv li lawv xaiv lawv tus khub, kev xaiv tuaj yeem ua rau muaj kev hloov pauv hauv cov pej xeem. Ib qho laj thawj yog kev xaiv khub niam txiv yooj yim lossis xaiv kev sib deev; rau piv txwv , poj niam peahens yuav nyiam peacocks nrog loj, ci tails.
Tib neeg kuj nug, yuav ua li cas thiaj tsis sib haum xeeb ua rau muaj kev hloov pauv?
Zoo li recombination, tsis yog - random mating tuaj yeem ua raws li cov txheej txheem ntxiv rau natural xaiv rau ua rau evolution tshwm sim. Txhua qhov kev tawm mus los ntawm random mating upsets lub equilibrium faib ntawm genotypes nyob rau hauv ib tug pej xeem. Qhov no yuav tshwm sim txawm tias kev xaiv khub niam txiv yog qhov zoo lossis tsis zoo assortative.
Dab tsi yog ob qho piv txwv ntawm kev sib tw tsis sib xws?
Qhov zoo tshaj plaws piv txwv yog nyob rau hauv peacocks, qhov twg poj niam peahen xaiv ib phooj ywg raws li qhov loj thiab flashiness ntawm tus txiv neej lub tail feathers. Qhov no sib txawv ntawm cov txiv neej thiab poj niam ntawm ib hom nyob rau hauv thiaj li yuav nyiam cov phooj ywg hu ua kev sib deev dimorphism.
Pom zoo:
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