arm ratio meaning in English

（染色体）臂长比
臂比
臂长比

The first and second longest chromosomes are important in karyotype analysis and most of which are metacentric chromosome and submetacentric chromosome in lilium . hybrids were distinguishable by the existence and position of secondary constriction and arm ratio
百合的第一对和第二对染色体多为中着丝粒和近中着丝粒染色体，可以根据次缢痕有无与位置及臂比鉴定杂种。