Cute

[u/Acceptable-Elk3412]

I don't know what I was expecting after she said, but they're also something else.

[u/781nnylasil]

This is all because of the DNA they inherited from their mom. She passed on more DNA from her black parent to the more black looking daughter and more DNA from her white parent to the white looking daughter. They both got 50% of their DNA from their mom but it’s not a guaranteed 25% from each grandparent.

[u/stuff_of_epics → u/781nnylasil]

It’s not that it’s more or less, total. I suppose you could say ‘more’ if looking specifically at the genes that encode for darker skin. But the point is that it’s the actual gene(s) itself and not how many from either side; statistically, each grandparent accounts for 25%.

[u/Proper-Equivalent300 → u/stuff_of_epics]

I had a tl;dr but I’m party to the same thing. My in laws are Jamaican and we have talked about this as everyone looks like the United Nations in our extended family. The colors that come out don’t make sense yet here we all are 🇯🇲🇻🇪🇳🇿🇫🇮🇬🇧🇺🇸

The long history of marriage back and forth with the Scots and Brits that originally settled in Jamaica has set up a sweet spot in genes expressing this way, right now.

I found a story on msn a just few years ago. These girls are the most famous but a pile of twins are now happening and in each documented family one parent is always Jamaican (edit: at least in that article)

[u/AsperaRobigo → u/stuff_of_epics]

This isn’t necessarily true. Statistically it’s most likely that it’ll be close to a 25-25-25-25 distribution, but when your body is making eggs or sperm, it doesn’t distinguish between DNA you got from your mother or your father. This is a phenomenon called random assortment.

Random assortment means a pair of eggs that formed from the same germ cell might be 80% one parent and 20% the other. If one of those eggs ends up fertilized, the resulting offspring’s DNA will be 50 percent identical to each of its parents, but in similarity to its grandparents will have a 10-40-25-25 split.

This isn’t necessarily common, since an even outcome is more statistically likely when things are random, but it’s not impossible for it to have happened in the case shown in the video.

[u/_that_dam_baka_ → u/781nnylasil]

Isn't there something about dominant genes too?

I don't see why this is abnormal? Surprising, maybe. But fraternal twins looking different is expected, right? It wouldn't be shocking if it was not it girl or if they were simply siblings, not twins.

[u/Slugginator_3385 → u/781nnylasil]

They really did the pale ginger pretty dirty lol

[u/ArjJp → u/Slugginator_3385]

Twin to Twin Melanin Transfusion Syndrome