National Siblings Day

A bit about sibling DNA sharing, in honor of National Sibling Day

A bit about sibling DNA sharing, in honor of National Sibling Day

Did you know that by textbook definition, full siblings (brothers and sisters who share a common mother AND father) are supposed to have about 50% of their DNA in common? From projects like the crowd-sourced data collection project by DNA Central founder Blaine Bettinger — The Shared cM Project explained well in this post by Leah Larkin — we have learned that human biology doesn’t always follow the rules!