This question is asked quite frequently. How much genetic information that is shared between siblings will depend on a number of factors.
Let’s look at each situation. For example, if two siblings have the same mother and father also known as full siblings. The research shows that this type of sibling relationship shares 50% of their parents DNA. If they are siblings who share one common parent (also known as half siblings) This siblingship type will share roughly 25% percent of the common parent’s DNA. Now if the siblings are identical twins they will share the same exact DNA from both parents.
Only identical twins have the same DNA genetic blueprint. Other sibling relationship types share some DNA. Essentially, the amount of shared DNA siblings have will depend on if the siblings share both parents or one parent.
It should be noted everyone shares the 50% of their DNA with their mom and 50% with their dad. Siblings share around 50% of their DNA, half siblings around 25% and so on.
Although we receive 23 chromosomes from our mother and 23 chromosomes from our father. A better question then asking which parent contributes more genes is, Which parent’s genes do more. Most of the surface level differences we see between people are not due to the genes themselves, but to a series of chemical “switches” that sit on top of our DNA and tell our body which portions to read and translate into protein and which to ignore. In a phenomenon called imprinting, these switches entirely shut off certain genes — but only when they come from a particular parent. These patterns persist across generations. There are a few theories on which parent may contribute genetic information to their child more. But, in essence, knowing which parent contributed more to a child there is not enough information that can definitively lean to one parent over the other. Although, some research believe the mother contributes 51% and the father contributes 49%. We cannot definitively say parent contributes more but it should be noted that your environment will play an important part in turning switches off and on.
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