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.
Rating Newest Oldest. Best Answer: DNA in siblings is actually closer to one another, than to the DNA in thier parents... On average, full siblings (share both biological parents) have 50% of their DNA in common, half siblings (share only one biological parent) have 25% of their DNA in common. . Source(s): http://www.dnasi.com/familystudies/sibli... aren't the following answers exactly what i said? glad i got two thumbs down for it.