You would share up to 12.5%.
EDIT: NO, that would be a first cousin. A third cousin would share <1%.
You share around 0.2% of your DNA with a fourth cousin. This is because fourth cousins are about five generations removed from a common ancestor.
You would share approximately 12.5% of your DNA with a first cousin. This is because you share a pair of grandparents with your first cousin, resulting in genetic similarities but less than with a sibling.
100%
This question cannot be answered because the term "half-cousin" has no meaning. Presumably, the term is intended to be analogous to half-sibling, where children share one but not both parents. In the case of cousins, however, the relationship derives from a single common ancestor, and you can't have half of one common ancestor.
Some of your DNA will be the same! You are likely to have somewhere between 1/8th and 1/16th of the same DNA.
You share around 0.2% of your DNA with a fourth cousin. This is because fourth cousins are about five generations removed from a common ancestor.
You would share approximately 12.5% of your DNA with a first cousin. This is because you share a pair of grandparents with your first cousin, resulting in genetic similarities but less than with a sibling.
Cousins would share up to 50% of the DNA.
98%
100%
Humans share approximately 98-99 of their DNA with other animals.
This question cannot be answered because the term "half-cousin" has no meaning. Presumably, the term is intended to be analogous to half-sibling, where children share one but not both parents. In the case of cousins, however, the relationship derives from a single common ancestor, and you can't have half of one common ancestor.
You share some DNA with everyone to whom you are related. Since you have a common ancestor with your father's cousin twice removed, you are related and share DNA. More broadly, every human being has large amounts of DNA that are shared with every other human being. That is what makes us humans, as distinct from chimpanzees, orangutans, gorillas or mice.
Some of your DNA will be the same! You are likely to have somewhere between 1/8th and 1/16th of the same DNA.
No. First cousin share 1/8 of your variable genes and only 1/32 with second cousins. With third cousins you share only 1/128.
Not very likely the other will test as high because the two cosins are from two different parents with two totally different DNAs. Only one that might come close to matching a test is an identical twin. I wold say cousin number 1 is the parent!
first cousins CANNOT have the same DNA. siblings share 50% of their DNA, and first cousins share 25%. I'm not sure which test you are refering to, as 99.9% DNA match would infer identical twins.