haemophilia! can it skip a generation?

[justamumofone]

i hope someone can help me here. my daughters father has haemophilia, which would make her a carrier im told.
when she was born im told they can test instantly once baby is born by taking blood from the cord. however i do not remember this.
nor was i told if she was or wasnt.
basically to cut the story short my daughter is now 8 years old and the dad is now in belief he is not the father because there is noevidence of her being a carrier.
obviously i will be getting a DNA test to shove in his face but i was just hoping someone with experience may know if skipping a generation is possible? thanks in advance for any advice of info given.

What do you mean “no evidence of her being a carrier”? Carriers by definition do not suffer from the disease they are carrying so there would be no symptoms. It’s why you have to run tests to find out if a carrier or not.

As for skipping a generation, the daughter of a male haemophiliac is always a carrier because the gene is a mutation on the X chromosome. The father is XY and the gene on his X is what makes him a haemophiliac. That same X is the X in his sperm that met your egg which is always X and resulted in XX a daughter. She in turn, has a 50/50 chance any son of hers will have haemophilia.

DNA test is best way to prove paternity.

Haemophilia can be carried on the X chromosome, but manifests in male children.

As girls are born with two X chromosomes, the 'good' one compensates for the dodgy one.

Boys only have one X chromosome, they other being Y. There's no compensation.

Carriers do not have the condition, but they can pass it on to the next generation.

medlineplus.gov/genetics/condition/hemophilia/#:~:text=Hemophilia%20A%20and%20hemophilia%20B,sufficient%20to%20cause%20the%20condition.

Girls don’t get hemophilia but they can pass it on.

Hi @justamumofone, we're moving your thread over to our General Health topic as we think that's a better place for it.

Thanks to everyone who's responded so far.

If she’s the daughter of a man with haemophilia then she will be a carrier. It’s unlikely that she’d show any symptoms herself (though the NHS says there might be a possibility of unusually heavy periods later on). Your ex is an idiot, but it’s worth getting a DNA test because your DD is stuck with him as her father so it’s best to smooth the path as far as possible.

@justamumofone I know you posted this a long time ago but I couldn’t not post. My dad is a haemophiliac and I am a carrier. I can categorically tell you that a daughter of a male haemophiliac has a 50/50 chance of being a carrier. This is straight from my haematologist when we were having conversations when I was pregnant with my two boys.