biological sex and sperm/genetics

LolaBelle515 · January 2012

Hey all:)

I'm purely curious about the science.

Our known donor has 3 brothers, no sisters...so we joked before we started trying that we were sure to have a boy. (Not that we cared boy or girl AT ALL...just so thrilled to be makin a baby!).

We, indeed, ARE having a boy...and I'm curious how genetic biological sex is. Does the strength of boy sperm vs. girl sperm carry down through the generations?

I don't know how true any of this is--for those that went through sperm bank, is donor sibling biological sex on the donor proflile? Perhaps that's one way to tell if there is any science to this...

Just curious!

jeannkerricotober09 · January 2012

I don't have any answers but our donor has only brothers and we have a boy, too!

leapgirl8 · January 2012

This stuff is so interesting to think about, and there is so much we don't know yet. I'm not a biologist/geneticist/scientist and my science reading is purely recreational, but I don't think it matters. With as many families as humans have created over time, there are bound to be tons of coincidences like that. In Jen's family, all families had either all boys or all girls in her generation (she only has sisters, has a set of female cousins, two sets of male cousins, etc). Everyone thought the same thing would happen with their kids, but so far her sister and all of her cousins who have had more than one kid have had a mixed set.

I can't remember if we found out the siblings of our donor, but we're having B/G twins so I guess it doesn't matter for us

Meegs10.13.06 · January 2012

Trav has two brothers (he was the last ditch effort for a girl!)... and obviously we have Gwen. I thought for sure we would end up with a boy.

ball.and.chain · January 2012

Ha, this made me go check our donor profile (1 bro, 1 sis, but since I'm not pregnant this has no bearing on anything right now. It just made me curious).

What about the whole frozen sperm + IUI = more boys than girls thing? Is that valid? If so, I would think it might skew the results of this little survey...

I think about this stuff all the time because we have a girl name picked out that we are both very happy with but we can agree on NOTHING for boy names. It would just be so much easier to have a girl...

2brides · January 2012

Our donor also has 2 brothers and we had 2 boys. I always attributed it to the timing of the insemination close to ovulation.

gervaisj6 · January 2012

Hey, I am a lurker, so I hope y'all don't mind. Our donor has 1 brother, and we did a frozen donor iui, and we got a girl. but my re did say that female sperm survive thaws better than male sperm, and again- male sperm are sprint runners, and female sperm are marathon runners. We did injectibles for each iui, and I had an ultrasound immediately after each iui. I was in the process of ovulating when I had my last iui.

Fabi&Nita · January 2012

I think it has a lot to do with timing as another post said. We are having a girl and our TTC day was 4 days before our O date. We also looked up the Chinese calender and it was right ( we didnt know about it till we were pregnant) But for our 2nd i will try on a girl month.

2moms2twins · January 2012

So crazy I was thinking of this subject too.. but in part thinking along the lines of IVF and gender selection possibly another thread.

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