# Genetic Distance to Generations Calculation for Y-STR DNA tests

## What is genetic distance in Y-DNA?

Genetic distance is the term used to describe the number of differences or mutations between two sets of Y-chromosome DNA or mitochondrial DNA test results. A genetic distance of zero means that there are no differences in the two results and there is an exact match.

## How is genetic distance calculated?

The linkage distance is calculated by dividing the total number of recombinant gametes into the total number of gametes.

## How many generations is genetic distance of 2?

Genetic distance of 2 = almost certain that there are less than 11 generations to common direct-line male ancestor.

## Why is genetic distance calculated?

Genetic distance is useful for reconstructing the history of populations, such as the multiple human expansions out of Africa. It is also used for understanding the origin of biodiversity.

## What does Big Y STR differences mean?

The Big Y-500 STR Differences column is spurring all the recent interest. The higher number is obviously the number of markers beyond 111 that can be compared. These are the markers where neither compared participant has a no-call. It is the smaller number, however, that is generating a bit of disagreement.

## What is genetic distance matrix?

The GDM gives an intuitive and comprehensive view of the distance (or similarity) between any two genes loaded into MeV by creating a colored matrix representing all gene-to-gene distances.

## How do you calculate map units between genes?

Map units can be determine by calculating the percent recombination (recombination frequency) between the two genes on the chromosome. One percent recombination is equal to one map unit, two percent recombination is equal to two map units, and so forth.

### Do we have more female than male ancestors?Do we have more female than male ancestors?

Baumeister: “Today’s human population is descended from TWICE as many women as men.” Do we have more female ancestors than male ancestors? Men can vary much more dramatically in their

### Determining if match is paternal or maternal?Determining if match is paternal or maternal?

Commercial DNA test generally only test for autosomal DNA, which is inherited from both of your parents. This means that if your parents have not tested with your testing company,

### Can I remove facts from my tree obtained via other Ancestry.com members?Can I remove facts from my tree obtained via other Ancestry.com members?

Removing a fact or event In the Facts column, hover over a fact and click the Edit button that appears. If you hover over a fact and a button doesn’t