/sci/ - Science, Technology, Engineering, and Mathematics

Anonymous 18/07/03(Tue)12:20 No. 16671 ID: 91195d

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I’m a high school science teacher, and about 15 years ago I spent a year teaching science in Bogotá, Colombia at a private school. Rich kids, raised in Spanish and English. Great kids, in fact.

I was teaching genetics with one group and we were looking at blood types. Unlike North America, identification in Colombia includes blood type (seriously, this is a great idea for emergency situations, no idea why it isn’t here) so it’s common for people to know the blood types of their entire family. We did blood tests in class and the students were able to see that it matched up with their ID info. We then used this info with their family’s blood types to look at pedigrees.

One of the girls in the class came up to me after class with a concern. I don’t remember the exact blood types, but her parents blood types didn’t fit. Basically, there was no way her dad was her dad. I fumbled through some bullshit possibility of a mutation, but I learned my lesson - never again will I have students do blood type pedigrees with their families.

Anonymous 18/07/03(Tue)20:32 No. 16672 ID: be6f8f

All that test can tell you is that the person is not the child of *BOTH* of those two people. You can only use it to disprove one out of four possibilities:
1. Both parents are biologically related to the child.
2. The father is not biologically related to the child.
3. The mother is not biologically related to the child.
4. Neither parent is biologically related to the child.

#4 can't be disproven with this test, since obviously strangers can coincidentally have the same blood type. You could have told her that maybe she was adopted.

Honestly, I don't think you should stop teaching this. I didn't even know it was possible to disprove blood relation through blood type. This is useful information to have, ESPECIALLY if it uncovers infidelities and adoptions.

Anonymous 18/07/03(Tue)20:51 No. 16673 ID: aace8a

wincest?

Anonymous 18/07/15(Sun)11:35 No. 16676 ID: 83c873

I've had something along these lines happen! Super awkward!

Was looking after a 16 year girl who needed surgery. She asked if I knew her blood type, and I explained that the blood test was being processed and we'd know in an hour or so. She asked if I could let her know, because both Mum and Dad know theirs. They both proudly add they are O+. I explain that in that case she'll either be O+ or O-, because that's genetics.

An hour later her blood group comes back as A+. I tell her this, and then the three of them proceed to ask how that's possible given what I said earlier. I avoid mentioning infidelity, and weakly suggest perhaps her parents were mistaken about their own. Turns out they weren't, and Dad storms out after calling Mum a whore. Mum follows him, and I'm left with the daughter. So... about that appendix...

Anonymous 18/10/15(Mon)04:22 No. 16707 ID: 1659cb

File 153957016384.png - (95.98KB , 490x480 , tmp_28598-17311820756920899603.png )

There be lulz in this topic.

Polite sage desu~

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