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I think what you mean to ask is "is DNA testing reliable to determine siblingship in two individuals with the same mother but not the same father?" The answer is, yes, but it depends. DNA is the material that codes for the genes which are essentially the blue print for how we are made. We have 46 chromosome, 23 we get from our mother and 23 from our father. We also get some mitochondrial DNA from our mother only. So testing depends on the individual sex of the children involved, but using mitochondrial DNA, it is quite accurate, since all children born of a certain female should share this DNA.

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14y ago
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12y ago

A DNA test cannot give 100% proof of any relationship. It can only tell you what percentage of your genes are similar to another person's. For example, you might be 50% the same as another person, but the test alone would not tell you whether that person was your father or your son or possibly even your brother. You would need to use other information (e.g. age) to establish that.

Your DNA would be approximately 25% the same as your half-sibling's. But in fact it could be anywhere between 0% and 50% (although both these extremes are unlikely).

A three-person test would also show what percentage of genes you each shared with your father. Both of you should have exactly 50% in common with your father, and all the genes you share with your half-sibling should also appear in your father's pattern.

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14y ago

Yes, a proper DNA analysis can distinguish which brother is the father of a child.

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13y ago

Yes, but the sex chromosomes could not be used.

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Q: Is DNA accurate on siblings with the same mother but different fathers?
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Related questions

What does science say about siblings with same mother different fathers?

They are half siblings.


Why do they call it a half brother or sister?

Your half-brothers and half-sisters (half-siblings) are called half because instead of having the same mother and the same father as you, you have only one parent in common. Thus, you have half the common parentage that full siblings have. Half-siblings have the same father and different mothers, or the saem mother and different fathers.


How is Sid Tom sawyers half brother?

Sid is Tom Sawyer's half brother because they share one parent in common - their mother. They have different fathers, which makes them half siblings.


If you have the same mother but different fathers are you half-siblings?

Same Mother, Different Fathers ... Half Siblings:Yes, if you have the same mother but different fathers then you are half brothers or half sisters. However, if you and another sibling had the same father then you are not half siblings but brother and sister. It's the gene pool so it doesn't matter if your mother gave birth to you or not, if it's a different father then you are a half brother or half sister.No, if you have the same mother, you are not half siblings, only if you have different fathers, you are a half siblings. Nothing from the womb is half.Obviously the person who answered the question above is not very educated. This seems to be a misconception among the black community, (no offense... I'm half black myself). It doesn't matter if siblings share the same biological mother or father because you receive half your DNA from your mother and half from your father. So, to answer your question... it doesn't matter if you share the same mother or father, you're half siblings either way. Looks like the person above was sleeping in their science class or just a victim of misinformation.


If a child is result of an affair can the mother of said child force the siblings from the fathers marriage to meet since they are half siblings?

NO! You cant force half children to have a relationship.


What was medgar evers parents names?

Jessie Evers was his mother and his fathers name was James Evers. He also had 5 siblings.


If you have different fathers are you related?

If you have different fathers, you may be related if you share some other ancestor, such as a mother, a grandparent, great grandparent, etc.


How is Nathan Eminem's half brother?

They have the same mother and different fathers.


What is the saying I was told that if you have the same mother but different fathers you are not half nor whole siblings so what does that make you?

Your half siblings. My best friend's mom married before she got married to the man she is married to right now and now my best friend has 2 half brothers.


Would you be a half brother to your baby brother if you have the same mother but different fathers?

Yes.


Is it illegal for a mother and her child to live in a different city then the father?

If there is a custody agreement in place through the courts, the mother cannot take the child out of state without the fathers consent. If there is no agreement in place, the mother does not have to have the fathers consent.


We are 2 sisters that just found out we both have O negative blood. We have the same mother but were told we have different fathers. Is is possible for us to have different fathers or not?

yes it's just a coincidence that you have the same blood type cos you inherited half the genes of your mother