目前的假设,以及育种者的意见，一只有两个白色斑点等位基因（SS）拷贝的猫在其一半以上的身体上有白色，而只有一个副本（Ss）的猫的身体不到一半。本研究基于对西伯利亚猫的两个大型谱系数据库（PawPeds中的23,905个个体和FelisPolonia数据库中的21,650个个体）的分析。研究了白斑数量在不同白斑数量的猫后代中的分布。观察到与预期分布相比的显著差异。在许多情况下，应该是纯合子的猫中的白色含量不到身体的50％，而在许多所谓的杂合猫中，观察到大量的白色（超过50％）。这种现象也出现在经过验证的特定家庭的例子中，排除了育种者在确定白含量时可能出现的错误。收集到的证据表明，猫中白色量的遗传还涉及其他因素，因此应修改当前的假设。
The current hypothesis, along with the opinion of the breeders, is that a cat with two copies of the white spotting allele (SS) has white on more than half of its body, while a cat with only one copy (Ss) has white on less than half of its body. The present study was based on the analysis of two large pedigree databases of Siberian cats (23,905 individuals in PawPeds and 21,650 individuals in Felis Polonia database). The distribution of the amount of white spotting in the offspring of cats with different amounts of white was investigated. Significant differences compared to expected distributions were observed. In many cases the amount of white in cats that were supposed to be homozygous was less than 50% of the body, while in many supposedly heterozygous cats a very large amount of white (over 50%) was observed. This phenomenon was also presented on the verified examples of the specific families excluding possible errors in determining the amount of white by the breeder. The collected evidence suggests that there are other factors involved in the inheritance of the amount of white in cats and the current hypothesis should be revised.
