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pzmyers@freethought.online ("pzmyers 🕷") wrote:

It's things like this that make me dread going back to the classroom in January.

https://freethoughtblogs.com/pharyngula/2025/11/02/i-dont-know-if-im-ready-to-teach-genetics-again/

That's not how DNA works. Your brother would have his father's DNA and his mother's DNA. You, as a girl, would have your mother's DNA and your father's mother's DNA. You have only half of your father's DNA. You do not have your father's father's DNA. And this is why (if one's father has any brothers) it's difficult to prove a girl's paternity. All the brothers would have the same X chromosome so any brother could be the father. It's been pivotal in the Thomas Jefferson/Sally Hemmings controversies.