Alleles can be described as
i. dominant
ii. recessive
iii. codominant
iv. partially dominant
v. incompletely dominant

an adaptation is a change or process by which an organism takes to be better suited for its environment. for example; migration is a behavioral adaptation, this is needed because birds are not built to last extremely cold climates. there are different adaptations because there are different species needing to adjust to different things, bears don't migrate; they hibernate.

true, i don't really know what you're asking but from the info you provided im guessing the answer is true.