Why did mendel call his 2nd inheritance theory split rule

According to Mendel some genetic traits are passed from one to another generation and this generation was first explained by George Mendel. So, Mendel called this second inheritance theory split rule.

Explanation:

Mendel in his garden flower experiment concluded and gave two principles. Mendel's Law of inheritance has summarized into two laws. These laws are segregation and independent Assortment. The law of segregation explains if any trait of each parent's pairing of genes split and one gene passes from each parent to an off spring.