Same-sex unions are recorded in the history of a number of cultures, but marriage or similarly formalized same-sex unions were rare or nonexistent in other cultures.
Using this measure, siblings are actually 99.95% the same. The 50% refers more to the amount of DNA we get from mom and the amount we get from dad. So we are more similar to our relatives than we are to a mouse. Let's explore in a bit more detail what the 99.95% and the 50% numbers mean.
Siblings can match at any number of sites in a DNA test. Next, letâs see what that means for tests that try to figure out if two people are siblings. As youâll see, these siblingship tests can be very tricky to interpret. And they donât always give a clear result.