Suppose the tail length of two populations of jerboas is controlled by one gene. to determine the mode of inheritance, a homozygous short‑tailed female is crossed with a homozygous long‑tailed male. a short tailed jerboa. a long tailed, long eared jerboa. then, siblings from the f1 are crossed, and the number of short‑ and long‑tailed animals are counted to determine the phenotype ratio. match the phenotypic ratio anticipated in the offspring from a cross of two heterozygous individuals to the appropriate mode of inheritance for the short‑tail allele.