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 would share up to 6.25%.
You would share up to 12.5%. EDIT: NO, that would be a first cousin. A third cousin would share <1%.
One fourth
100%
we get half of our DNA from mom and half from dad. This really tells us how related we are to each of our parents.
You would share up to 6.25%.
You would share up to 12.5%. EDIT: NO, that would be a first cousin. A third cousin would share <1%.
Cousins would share up to 50% of the DNA.
One fourth
Humans share about 70-75% of their DNA with snails. This similarity is due to shared genetic sequences that have been conserved over evolutionary time.
100%
98%
we get half of our DNA from mom and half from dad. This really tells us how related we are to each of our parents.
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.
Humans share at least some genes (DNA) with all living organisms. As far as plants, it is around 15%.
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 have no blood line relation, You don't share DNA whatsoever. In this scenario putting an example; you and your half-sister share, let's say, the same father but not the same mother and your half-sister's half-sister share the same mother but not the same father. There is no shared DNA between you and your half-sister's half-sister.