would a brother and sister have the same dna?
1268
Because of recombination, siblings only share about 50 percent of the same DNA, on average, Dennis says. So while biological siblings have the same family tree, their genetic code might be different in at least one of the areas looked at in a given test. That's true even for fraternal twins.
88439
Yes! Identical twins came from the same sperm and egg, so they have the same chromosomes and genes. ... So identical twins with identical DNA may have different genes turned on, causing them to look and act differently, and even to develop different diseases such as cancer.
210979
Scientists have shown that identical twins have very similar marks when they are born. But, as they age, the marks in their DNA become more and more different. So even though identical twins have the same DNA, they are using it in different ways.
548438
However most identical twins grow up together and not only share the same genetics, but also the some environmental influences. ... My twin sister and I have almost always weighed the same or very, very close to the same.
774895
Sister chromatids always start off identical, because they result from DNA replication; the DNA of both of the two sister chromatids is identical to the DNA molecule that was replicated, and so the two chromatids are also identical to each other.
634942
DNA wise, it's 25% for half siblings and 12.5% for first cousin. This could be more or less, but even then, it's unlikely a first cousin will share more than a half sibling.
136601
Identical twins do not run in families; rather, they are random. Without DNA testing, there is no way to know if your great grand uncles or aunts were identical or not. However, twins who share close similarities are more likely to be identical rather than fraternal.
555877
Identical twins share the same DNA and have, in principal, the same set of genes. But they already start to differ while in the womb. When they are born, they are no longer identical - they do not, for example, have the same fingerprints.
482935
Sister chromatids are 2 copies of a single chromosome and so are genetically identical (they also are physically attached to one another). ... They are homologous chromosomes: they have the same set of genes, but their alleles for those genes can be different (since your mother and father are not genetically identical).
487622
Sister chromatids are by and large identical (since they carry the same alleles, also called variants or versions, of genes) because they derive from one original chromosome.
168754
Of course, a lot of the gene pairs in your genome are actually the same, so it wouldn't matter which copy you used, but the odds of constructing an exact duplicate genome by chance are still vanishingly small. And even identical twins don't necessarily have identical DNA.
1199147
If they get married, they are legally related. If they have the same blood (blood line ) they are genetically related.
1284340
No two siblings are the same, not even identical twins. Parents often puzzle about why their children are so different from one another. They'll say, 'I brought them l up all the same. ... The siblings realise that they have to cling together in order to survive.
1055935
Fraternal twins really aren't any different than two siblings (except they happened to share the same womb at the same time). Each of these twins is the result of a separate egg being fertilized by a separate sperm. ... And since brothers and sisters can have different blood types, so too can fraternal twins.
1207933
It's not possible. Identical twins are completely identical. That's why DNA tests can't tell which twin is which. As their DNA are completely identical, their natural hair color will always be the same.
1285118
Full siblings have the same mom and the same dad. So these siblings are getting all of their genetic information from the same two people. Half siblings only share DNA from one parent. The genetic information from the other parent is different.
1100591
Like most full siblings, non-identical twins share 50% of their DNA. Identical twins, however, result from a single fertilised egg (one zygote) separating into two parts during early cell division.