This is called a chemical bond.
Well, I'm assuming you're talking about these terms...
Species, Genus, Family, Order, Class, Phylum, Kingdom, Domain
A good way to remember this is;
Does King Philip Come Over For Great Spaghetti
(However, this is in order from most specific to least specific)
Females are more likely to be carriers of X-linked traits, and males are more likely to express them.
ANSWER:I think the answer is number 3