# What would the starting shared cM number be for abnormally close relationships in Autosomal DNA test?

## How many cM is a good DNA match?

A strong match will have around 200 cM or more.

## How many cM would a half uncle share?

According to the relationship chart from Blaine Bettinger’s Shared cM Project (2017), the 99% range found for a half aunt/uncle was 500-1446 cM.

## How many cM do first cousins share?

Note that a given relationship, such as first cousins, can share varying amounts of DNA because of recombination (“shuffling” that occurs at conception). You usually share about 850 cM with a first cousin, but that number could be as low as 553 or as high as 1,225 cM.

## How much DNA Can you share and not be related?

How small is small enough to suspect that the DNA match may not be related? DNA segments that are less than 6-12 centimorgans (cMs) in length have a likelihood of a common ancestor within 6-8 generations of only about 5%.

## How many shared centimorgans is significant?

For example, you’ll usually share about 120 centimorgans with a 3rd cousin, but it’s possible to share as few as 90 or as many as 200.
What does the match confidence score mean?

Approximate amount of shared DNA (in centimorgans) Possible relationship
200—620 2nd cousin
90—180 3rd cousin
20—85 4th cousin
6—20 Distant cousin: 5th cousin — 8th cousins

## What is a high percentage of shared DNA?

But there is great diversity in the amount of DNA shared between any two individuals with a particular relationship.
Average Percent DNA Shared Between Relatives.

Relationship Average % DNA Shared Range
1st Cousin Great-grandparent Great-grandchild Great-Uncle / Aunt Great Nephew / Niece 12.5% 4% – 23%

## What is considered close family on ancestry DNA?

Your AncestryDNA close family matches could include an aunt or an uncle, a niece or a nephew, a great-grandparent or a great-grandchild, a half-sibling, or a double-first cousin. Someone who appears in this category is rarely a first cousin.

## How much DNA do half-siblings share in CM?

When it comes to full siblings, they share between 1,613 to 3,488 centimorgans (cMs) of DNA. For half-siblings, they will typically share anywhere from 1,160 to 2,436 cMs of DNA. In other words, you and your full siblings share 50% of your DNA while your half-siblings will share 25% of your DNA.

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