Amount of X DNA shared by close family

JavaScript isn't enabled in your browser, so this file can't be opened. Enable and reload.

I am collecting data on just X chromosome shared among close family members in order to better help adoptees figure out relationships.

Here is an example of how to get that data:

At 23andme you would need to use the table view in FIA where you might see something like:
name v name X 32000000 45000000 22.5 1592
name v name X 109000000 155000000 71 5057

Here the total cM is 93.5, there are 2 segments, and the largest segment is 71

At family tree DNA you would look at the table view in the chromosome browser to get these numbers

At GEDmatch you would do a one-to-one comparison on the X chromosome to get them

What is the family relationship? *

I am collecting data on the amount of matching X in close family members. If your relationship is not listed, then I am sorry, I am not collecting that data (for example sisters always share a full X). However half relationships via a mother can be included on any of the brother relationships

brother to brother or brother to sister or half siblings with a shared mother

uncle to sister's child or brother's daughter

aunt to brother's daughter

aunt to sister's child

maternal grandmother to grandchild

grandfather to his daughter's child

g-grandmother to g-grandchild (with X expected)

female first cousins, parents are brothers

other first cousins with expected shared X

How many total cMs are shared on the X chromosome? *

Enter a number like 95.5 and only include 0cM when shared X is expected. For men, any segments 3cM or larger can be included, for woman 7cM or larger

How many total segments are shared on the X chromosome? *

Male to male can include segments as small as 3cM, otherwise only count the ones greater than 7cM

What is the size in cM of the largest segment on the X chromosome? *

Are both individuals from an endogamous population?

Some populations are very intermarried, Ashkenazim, Colonials, Mennonites, Polynesioans ... So check yes if so

Yes

Maybe

Optional email address

In case I have a question about your answers

Submit

Clear form

Never submit passwords through Google Forms.

This content is neither created nor endorsed by Google. Report Abuse - Terms of Service - Privacy Policy

Forms