Thaum ib haiv neeg sib cuam tshuam, qee zaum kev sib koom ua ke tsis tuaj yeem tshwm sim vim tias ib lub cev xaiv mus ua phooj ywg nrog lwm tus raws li qee yam zoo. Hauv qhov no, cov tib neeg hauv cov pej xeem xaiv cov kev coj cwj pwm tshwj xeeb, thiab cov kev xaiv no tsim cov kev sib txuas ntawm caj ces uas tshwm sim nyob rau tiam tom ntej.
Yuav ua li cas yog qhov cuam tshuam ntawm kev sib raug zoo ntawm cov noob caj noob ces ntawm cov pejxeem?
Kev tshwm sim tshwm sim ntawm kev sib tw tsis sib xwszoo li kev sib koom ua ke, kev sib tw tsis sib xws tuaj yeem
ua raws li cov txheej txheem ntxiv rau kev xaiv ntuj tsim kom muaj kev hloov pauv tshwm sim. Txhua qhov kev tawm mus los ntawm kev sib raug zoo sib xws ua rau muaj kev sib npaug ntawm cov genotypes hauv cov pejxeem.
Ib qho piv txwv ntawm kev sib tw tsis sib xws yog dab tsi?
Kev sib tw tsis sib xws yog qhov tshwm sim uas tib neeg xaiv lawv tus khub raws li lawv cov genotypes lossis phenotypes. Piv txwv ntawm hom mating no tshwm sim hauv hom xws li tib neeg, peacocks, thiab qav. Nonrandom mating tuaj yeem tshwm sim hauv ntau hom, ib qho yog assortative mating.
Yuav ua li cas kev sib raug zoo tsis sib haum xeeb cuam tshuam rau allele zaus hauv cov pejxeem?
Kev sib raug zoo tsis sib xws yuav tsis ua rau txhua qhov ntau zaus hauv cov pej xeem hloov pauv ntawm nws tus kheej, txawm tias nws tuaj yeem hloov pauv genotype zaus. Qhov no ua rau cov pejxeem tsis nyob hauv Hardy-Weinberg equilibrium, tab sis nws yog debatable seb nws suav li evolution, vim hais tias cov allele frequencies nyob tib yam. Gene flow.
theem twgrandom mating tshwm sim?
Nyob rau hauv meiosis kuv, hla thaum lub sij hawm prophasethiab kev ywj pheej assortment thaum lub sij hawm anaphase tsim pawg chromosomes nrog tshiab ua ke ntawm alleles. Genetic variation kuj qhia los ntawm random fertilization ntawm gametes tsim los ntawm meiosis.
