I saw this somewhere a few days ago... Despite the story, I just couldn't help thinking about the fact that there's 243 people in a single class and the fact that somehow all those people never learned this in high school and are just finding this out in University.

My son texted one day asking my blood type. I told him B+. He said that his Dad had to be A- because he tested AB-. I said, well then that's what he has because I am 100% positive that he is your father. Then I thought, what if some poor kid in high school in a tiny town in MS discovered that his dad is not really his dad from science class in 10th grade? Well, that s**t really happens.

Most of the responses are saying how s****y biology is for this, but in reality it's the mother that's s****y... Don't cheat. What a concept!

JFC. Just goes to show that your dishonesty will come back to bite you eventually.

I found it interesting that one of the twitter comments blamed the biology class for the break up of homes and not the infidelity!!

Just found a niece I never knew about because of AncestryDNA testing. She's a wonderful person.

I hope that she stays close to the man who raised her, and that he has the maturity to not blame her.

I am AB+. My ex-wife is O-. My daughter insisted for years that she was O+. I told her that was impossible. She insisted. I said we could get a DNA test to settle this. She didn't want to, insisted that her mom would never have cheated on me, but still insisted she was O- despite that being an impossibility. Finally, she donated blood when she turned 18. Guess what? A-. She's probably mine. Science wins again.

The very reason these kind of experiments are no longer carried out in high schools in Australia.

getting divorced after 21 yrs from the fling... uh, unless it's still going on, let it go.

We had a similar story from our biology school teacher - he was teaching about the ability to roll your tongue is a dominant trait, and a kid went home, found neither of his parents could roll their tongues, and that's when they had to confess he was adopted as a baby

I wouldn't mind finding out I have a different dad..... as long as the new one turns out to be really, really rich or royalty or something

“Biology is a major cause of broken homes.” No immorality is.

"Biology is the major cause of broken homes." Well, yes. And not the bio class, either.

S**t happens.......

The plot of the Whoopi Goldberg / Ted Danson movie Made in America comes to life...

Unfaithful morons, smh

Moral of the story: if you're going to have an affair, don't encourage your kid to take an interest in biology!

The eye color thing though...that one can trip you up. I have brown eyes, so does my son's father. Our son? Crystal blue eyes. In laws both had brown eyes. My mother has green eyes, her parents had blue eyes. My father his parents, all brown eyes. So eye color CAN skip generations!

I hope the student got a pass for the lesson.

This sort of lie/deception should be a punishable crime. Why are women allowed to get away with causing this kind of harm?

My dad isn't my biological dad, but he does have blue eyes and so do I. The blood type thing though...... I have no clue what his blood type is lol

I'm glad for family resemblance...never any doubts, even as an angsty teen. Same with my kid.

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OMG! This is why I wanted to take biology! ;-; XDDDDD Plus, isn't it better for her to know than for her not to know? What does that make her real dad's blood type?

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I know I should be serious about this and i feel so sorry for that poor girl but If that ever happened to me then, I might actually do the tide pod challenge.

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And why did this student think they had the right to upload this on social media for a bit of measly attention?