What are the chances that my cousin is not my uncle's child?

Baldness is hereditary but through the maternal grandfather. If his mother’s father was bald or balding then most likely he would be as well regardless of his father’s hair.

I read not too long ago, but can’t remember the source (old age is hell) that an astonishing number of children do not have the father they and the rest of the world assumes they do. So anything is possible. You know what’s good for the goose is good for the gander and sometimes males have this overpowering biological imperative to spread their seed!

Fifty fifty.

GQ!

Our grandparents contribute a large part to our DNA ladders! Some times more of a percentage than the parents. (Generation skipping).

Hmmm, you don’t say what height the mother is. Height reverts to the mean, so over time the tendency towards being tall gets reduced.

Characteristics do not run by gender, but by the mix. The men in your family who all seem similar may have married women with similar characteristics (“she reminds me of mom”) except for your Uncle.

Here’s an alternative question: perhaps your uncle is similar to brothers of the same mother but has a different father? Know much about grandma during the war?

My last point is to tell you to not go around digging into stuff that others have to deal with. Figure that your aunt and uncle have dealt with it.

@rooeytoo is correct: Baldness traits come from the maternal grandfather.
It might be best just to drop it, since it doesn’t matter.

Male pattern baldness is passed from the maternal side.

DNA is a huge crapshoot and roulette wheel.

There are three boys in my husband’s family, all close in age. One brother is bald; the other two brothers have full, healthy heads of hair.

As you know, baldness comes through the mother’s side. What no one has told you so far is that an estimate ten to fifteen percent of children are not the children of the parents listed on the birth certificate. Of course, that means, the listed father is not the genetic father.

I have this data courtesy of my fertility andrologist, who sees an awful lot of genetic tests from men he treats. I would be more specific, but I learned this about 17 years ago, and it’s hard to remember these things precisely. But what I do remember is the number was shockingly high, in my opinion.

Of course it is possible. But if your uncle or aunt has had any of those traits in their family, even a long time ago, it can still “pop out” at any time.

I saw a talk show where two white people had a black child and so naturally the husband accused his wife of cheating, they did an DNA test and the child did belong to both of them. It turns out that a long time ago, one of their ancestors had slept with a black person and had a mixed child. Well that mixed child ended up sleeping with white people and so did their offspring until generations late you could not tell that their was a drop of black blood in their family.

These things can happen and this could be a case of that. I hope you find something out.

There could even be a “secret” adoption. A guy I know did not know until after he was eighteen that his biological parents were completely different people from the parents who railed him.