# Why do parent and child share more cM than full siblings?

## How many centimorgans do parent and child share?

The length of a piece of DNA is measured in centimorgans. The total length of all your chromosomes combined is around 7400 cM. Since a person inherits half of their DNA from each parent, you share about 3700 cM with each parent. The exact number for each parent/child relationship can vary slightly, but not by a lot.

## Who shares more DNA siblings or parent and child?

Our genetic likeness continues to drop by 1/2 with each increasingly distant branch in the family tree. However, there’s an important distinction — while everyone shares exactly 50% of their DNA with each parent, we share on average 50% of our DNA with our siblings.

## How many centimorgans should full siblings share?

3500 centimorgans

Siblings share around 50% of their DNA while half siblings only share around 25%. 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 would a parent and child share?

23andMe

Relationship Range in percentages Range in centiMorgans
Parent / child 50% ~3719 CM
Father / son (no X sharing) 47.54% ~3536 cM
Full sibling 38% – 61% 2826 – 4537 cM
Grandparent / grandchild; Aunt / uncle; Niece / nephew; Half siblings 17% – 34% 1264 – 2529 cM

## Can a child have more DNA from one parent than the other?

You can’t inherit more than half of an ancestor’s DNA.

You receive 50% of your genes from each of your parents, but the percentages of DNA you received from ancestors at the grandparent level and further back are not necessarily neatly divided in two with each generation.

## How many cM do 1st cousins share?

about 850 cM

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.

## Who is genetically closer sibling or child?

You’re equally related to your parents and siblings – but only on average. It’s often said you’re equally genetically related to parents as (full) siblings: your ‘relatedness’ is a half.

## Are you closer to your siblings or parents?

Despite being a unique combination of your parent’s genes and new mutations, you are, on average, equally genetically close to both your parents and siblings.

### Interpreting 23andMe results for half siblings that share 45.5% of their DNA?Interpreting 23andMe results for half siblings that share 45.5% of their DNA?

From the The Shared cM Project 3.0 tool v4 it appears that 45.5% equates to 3,394 cM. On the same page this suggests that you and your “half sibling” are:

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