Zonotrichia albicollis isolate:Tan morph Genome sequencing and assembly. Zonotrichia albicollis isolate:Tan morph

The White-throated Sparrow is a passerine bird of the American sparrow family Emberizidae, which has been studied extensively as it maintains a 100Mb inversion polymorphism on chromosome 2 via disassortative mating. The inverted arrangement is maintained in a near constant state of heterozygosity. Approximately half of the population is homozygous for the ZAL2 arrangement, whereas the other half of the population has the heterozygous condition. The exceptional inversion polymorphism (ZAL2m) in the white-throated sparrow (Zonotrichia albicollis) is linked to variation in plumage, social behavior and mate choice, and is maintained in the population by negative assortative mating.

白喉带鹀（White-throated Sparrow）是隶属于美洲鹀科（Emberizidae）的雀形目鸣禽，该物种已被广泛研究——因其可通过负选型交配（disassortative mating）在2号染色体上维持一段100Mb的倒位多态性。该倒位构型始终维持在近乎恒定的杂合状态：种群中约半数个体为ZAL2构型纯合子，剩余半数则处于杂合状态。白喉带鹀（Zonotrichia albicollis）中存在的特殊倒位多态性（ZAL2m）与羽色、社会行为及配偶选择的变异相关，并通过负选型交配在种群中得以维持。