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For example, we all start out with a single cell and end up with somewhere around 50 or trillion cells.

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The DNA in all of these cells needed to be copied not trillion times but a lot. The machinery in our cells that copies our DNA is incredibly good at what it does, but not perfect.

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Occasionally, it makes a mistake that is not fixed. Our DNA also changes in response to things like sunlight or the food we eat. Both can damage the DNA causing mistakes to happen.

If any of these changes happen in an egg or sperm cell, then that change will be passed on. This would mean you and brtoher sister's kids would be just a bit different.

Double First Cousins -

Sometimes when a sperm or an egg gets made, a gene can get broken or fixed. This can result in a new trait not seen before in the family. How might this work? If we think about you and your sister, you each got brothwr your DNA from your mom and half from your dad.

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What does that really mean, though? Remember, almost all of our genes are found on 23 different chromosomes.

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We each have 2 copies of each of these chromosomes except for males who have an X and a Y instead of two X's. This also means that we have 2 copies of nearly all of our genes.

When an egg or a sperm gets made, each of the two chromosomes is randomly sorted so that the sperm and egg only get 1 of each chromosome. Does this mean that you have mom or brohter exact same chromosome?

We are all much different than. Before the chromosomes get sorted out, there is a lot of mixing and matching between two of the same chromosomes. This is called recombination.

For example, your chromosome 5 is not an exact copy of mom or dad's chromosome 5. The chromosome 5 your broher gave you is a mix of both copies of his chromosome 5 -- it isn't exactly the same as either one by.

Brother and sister marry brother and sister

Sometimes this mixing can change genes so that new traits arise. Let's think about blue eyes as an example.

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Imagine dad has blue eyes because of a mutation at the front end of brother and sister marry brother and sister copy of his brown eye color brtoher and a different mutation at the back sjster of the other copy of the gene.

Each gene has a single mutation but at different places in the gene. Now imagine that when his sperm is being made, the middle part of the eye color gene is switched between the two genes resulting in one brown eye gene and one blue eye gene with two mutations.

Now dad can produce a brown-eyed child. This was the hard. It helped me to think about you and your sister each having two kids.

Would the true brother and sister be more related than the first cousins? The answer, I think, is yes.

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You got a random mix of genes from your mom and amd and so did your sister. The same is true for your husband and his brother. What this means is that your kids will get a subset of genes from their grandparents.

Your nieces and nephews will get a different subset. A double cousinship occurs only when a set of siblings marries another set of siblings and both have children.

This could be two sisters marrying two brothers. In your case, this is a brother and sister marrying a sister and brother. Double cousins actually share the same gene pool as siblings.

The members of House Targaryen, like their ancestors of the Valyrian Freehold, often married brother to sister to keep their bloodline pure, in order to control the . Incest /ˈɪnsɛst/ is human sexual activity between family members or close relatives. . In Norse mythology, there are themes of brother-sister marriage, a prominent example being between Njörðr and his unnamed sister (perhaps Nerthus). became brothers-in-law when David married Jonathan's sister Michal. Sibling- in-law is a word phrase referring to the sibling of one's spouse, or the spouse of one's.

They share all four of the same grandparents. Most cousins share only one set of grandparents.

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First cousins can also be cross cousins. Cross cousins are those cousins who descend from a brother and sister.

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In your case, it was two sets of siblings, tallahassee gay they were still cross cousins. There is another type of cousinship that is possible with first cousins. When the siblings are the same, as in two brothers or two sisters, the offspring, in addition to being first cousins, are also known as parallel cousins.

While double first cousins are double because they share both sets of grandparents, that is generally where such special references end. As you get to second cousins on down, the tree for proving this shows descent from a single individual.

While these individuals would obviously be second cousins on many lines, that is where the special circumstance ends.