If you mean blood types, yes. If both parents carry the recessive "O" blood gene there is a 1 in 4 chance each child could be type O. If you can find out the blood types of the parents' parents and...
I'm assuming here that you do not mean the living plant that grapes grow on, since you are in the language category; in which case "Grapevine" refers to, usually means, a network of gossip,...
There are two ways to look at current. Conventional current (measured in amps) flows from positive to negative. This model works for the vast majority of electrical engineering purposes.However,...