妈妈和儿子的dna不同吗

When the rankings came out, both the representatives of the five-star colleges and the bystanders were in an uproar. Ning Xiaocheng, the most promising person in Shenfeng Academy. He only got 10 points. This score is really embarrassing. Fortunately, Ning Cheng's score is not the lowest. There are also people who only get 5 points....