Responses
From what I understand of this abo verse Yin & Yang are a minority in the population, yin can be be born from a yin or non-yin mother & have a yang or non-yang father. It seems that a yang can only be born from a yin mother, but I’m not sure if only a yang can sire a yang or if yang’s simply have a higher chance than non-yangs to beget one.

If Yang can't give birth, and Yin only give birth to Yang, then how are Yins born?