# Understanding 1,102 shared centimorgans?

## How many cM do full siblings share?

around 3500 centimorgans

The amount shared is usually expressed in something called centimorgans. Full siblings tend to share around 3500 centimorgans while half siblings share closer to 1750.

## How many cM of DNA 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 many centimorgans do 3rd cousins share?

23andMe

Relationship Range in percentages Range in centiMorgans
2nd cousin once removed; Half 2nd cousin 0.6% – 2.5% 45 cM – 186 cM
3rd cousin 0% – 2.2% 0 – 164 cM
4th cousin 0% – 0.8% 0 – 60 cM
5th cousin to distant cousin Variable Variable

## How many cM is a good DNA match?

A strong match will have around 200 cM or more.

## How do half siblings show up on AncestryDNA?

50 percent of each half sibling’s DNA comes from the shared parent, and they inherited about half of the same DNA from that parent as one another. Testing a half sibling can help you fill in that sibling’s non-shared parent’s ethnicity and show you the ethnicities inherited by that sibling.

## Can a full sibling share only 25% DNA?

DNA segments come in all different lengths and sizes

On average full siblings will share about 50% of their DNA, while half siblings will share about 25% of their DNA. The actual amount may vary slightly since recombination will shuffle the DNA differently for each child.

## 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

## How many cM do 2nd cousins share?

Generally speaking, second cousins will share between 75-360 centimorgans (cMs) of DNA. A centimorgan (not to be confused with a centimeter) is a term used to measure the genetic distance between two positions on a chromosome – in other words, the length of a shared DNA segment.

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