Part of what makes genetics so interesting is that a lot of their effects aren't visible. But some people can learn a lot about their biological inheritance by simply comparing themselves to their ancestors.

Shelby Contra, 23, is one of them. Recently, she tweeted photos of herself and her grandmother to show just how similar the two looked when they were about the same age. "Grandma's genes really hit copy n paste huh," Shelby captioned the pics.

Her tweet went viral and nearly 555K people have already liked it, leaving over 1.1K responses. Many of which are their own side-by-side images that show their uncanny cross-generational resemblance. Continue scrolling and check out some of the craziest ones!

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