If people are blood relatives, is their DNA similar?

Question

If people are blood relatives, is their DNA similar?

Answer 1

For instances; your brother is about 50% genetically related to you. If he was your identical twin ( monozygous ), then you would have 100% of your genes in common. Cousins are at about 25%. etc., etc..

Answer 2

Some of the answers are out by a bit in the case of siblings - it is statistically possible for two non-identical siblings to have no genes in common as each parent passes on exactly 50% of their chromosomes...

Here is the correct ratios:

identical twins - 100%
non-identical siblings - 0-100%

parent - 50%
grandparent - 25%
great grandparent - 12.5%
etcetera

relatives who aren't in your direct line (aunts/uncles/cousins) will share a differing amount of dna

It should be pointed out that dna is the incorrect term here - i think you meant genes. Deoxyrybonucleic acid is the chemical with which cells store genetic information, so in a sense DNA is similar for all organisms (some viruses however use RNA) ;)

Answer 3

Actually, the initial responder was a little off with his numbers. This is (approximately) how genetically similar a person is to you:

Identical Twin = 100% similar
Parent, child, or sibling = 50% similar
Grandparent, grandchild, aunt, uncle, niece, nephew = 25%
cousins, great grandparent, great grandchild = 12.5%

Answer 4

definite. I as quickly as cradled a 9 three hundred and sixty 5 days boy as he died after he replaced into hit by making use of a vehicle. the two one among his legs have been traumatically amputated and that i've got been given to computer screen him bleed out earlier help arrived. I have been given particularly a great style of blood on my attempting to help, yet i replaced into 11 and had no first help education. additionally, this replaced into earlier cellular telephones have been person-friendly, so 2 human beings stayed with him on an analogous time as a third youngster ran to get help. no longer my popular reminiscence, it quite is for constructive.

Answer 5

yes they are recently in the british press a case was reported of a woman who was arrested i believe for drink driving ,when they took a DNA swab and tested it it came up with a very close match but of a males DNA.they asked her if she had a brother and she replied that she had any way to cut a long story short with her help they solved a 20yr? old case of a rapist and murderer who yes was her brother .

Answer 6

They would have certain alleles in common.